Top 10 ISO 27001 Certification Bodies

In this article we lay bare the top 10 ISO 27001 Bodies with guidance you must know before you engage with them and go for ISO 27001 certification. This is the ISO 27001 top 10 ISO 27001 bodies 2026.

How to Find an ISO 27001 Certification Body

We found this one of the hardest aspects of engaging an ISO 27001 company. Actually finding one.

Using Google, we found we were presented with those companies that had the most budget to spend on ads. This is a competitive market and a lucrative market. Dominating the Google ads comes with advantages for the ISO 27001 company but for the consumer we find that can translate into higher prices.

What to be wary of

The thing we recommend being wary of is the shared resource model.

Many of the ISO 27001 certification bodies use the same independent ISO 27001 consultants.

This pool of ISO 27001 consultants work freelance and make their money working for the many companies that are out there. What this translates to is getting the same resources but only the price differs depending on how you engage them.

This may or may not be important to you. If it is, then ask the question, do you employ third party contractors or do you use your own company employed staff.

Do your own ISO 27001 company due diligence before engaging any company.

Now it’s time for the top 10 ISO 27001 Bodies updated for 2026 our pick for best ISO 27001 Body 2026.

Being on the list does not constitute an endorsement by High Table or come with any guarantees or warranties.

Top 10 ISO 27001 Certification Bodies

1. BSI

The BSI are an ISO 27001 certification company and considered by many to be the gold standard. It comes at a cost but if you want the gold standard it is worth paying. These would be my goto for any new client wanting ISO 27001 certification as they are a recognised brand, a market leader, UK reseller of the actual ISO 27001 standard on behalf of ISO and a safe pair of hands. In 16 years of consultancy I have never had an issue.

2. SGS United Kingdom Limited

SGS are another large market player with a recognised brand and presence. A solid certification body of which I have positive experience. Being an established brand the badge and certificate will be recognised by larger clients.

3. A-lign

A certification body that comes at a price. A global player most notable for their SOC 2 Compliance Reporting. If you are getting SOC 2 then you know A-lign. As a result of being a SOC 2 compliance company they are one of the most expensive certification bodies we have come across on the market today for ISO 27001, especially for the ISO 27001 UK market. If you are considering aligning multiple certifications and you must have SOC 2 and ISO 27001 then they are worth very serious consideration.

4. Centre for Assessment Limited

We have experience of Centre for Assessment auditors and find them approachable and easy to work with. Costings appear reasonable.

5. British Assessment Bureau

They are technically – Amtivo Group Limited trading as British Assessment Bureau and Certification Europe. A certification with good UK presence and an audit company we have worked with on many occasions.

6. Tempo Audits

A new certification body targeting tech teams, startups and small teams. If you clients are small to medium sized businesses and you can not afford the cost of an established certification body then they are worth a look. When you engage with clients you may have to explain who Tempo Audits are until they build a market presence to challenge the established major players. My top tip for the budget conscious buyer.

7. NQA Certification Ltd

A certification body for which we have not had any experience. A quick Google and there were no obvious reviews. On the list for completeness.

8. Alcumus ISOQAR Limited

According to their website they are ANAB accredited. We found it difficult to find any reviews online and they are not a body we have experience on but they are on the list as they seem popular.

9. LRQA Limited

Our auditors are well-versed in assessing against ISO 27001, helping you to ensure that your information security systems align with the latest requirements and guidelines. We go beyond providing certification services with our industry-leading training programmes which have been designed to upskill your team.

10. Approachable Certification Ltd

Read the Approachable Certification Ltd small print and the terms and conditions in the contract VERY CAREFULLY

Best ISO 27001 Certification Body 2026 – BSI

Here is why the British Standards Institution (BSI) consistently stands out at the top of the list for ISO 27001 certification bodies:

1. The Direct Originator of the Standard

BSI isn’t just a certification body following a checklist; they literally created the foundational blueprint. In 1995, BSI authored BS 7799, which was later adopted internationally by ISO/IEC as ISO 17799 and eventually evolved into ISO 27001. When auditing against this standard, BSI’s institutional depth and historical understanding of why controls exist are unmatched in the industry.

2. Unrivalled Brand Weight in Global Procurement

When enterprise procurement teams, government agencies, or FTSE 100/Fortune 500 buyers review vendor security questionnaires, the BSI Assurance Mark (under UKAS accreditation) carries instant weight.

• Trust Signal: Because BSI is globally recognised for high standards, a BSI-issued certificate signals that an organisation’s Information Security Management System (ISMS) has undergone genuine scrutiny rather than a surface-level “rubber stamp”.
• Commercial Advantage: For businesses tendering for enterprise contracts, having BSI on the certificate often bypasses secondary third-party security audits.

3. High Auditor Calibre & Outcome-Based Rigour

While some budget certification bodies focus heavily on documentation templates, BSI auditors are renowned for testing operational reality:

• They evaluate whether controls effectively reduce risk in practice, examining patch frequency, access control enforcement, and incident response readiness.
• Their auditors generally bring extensive cross-industry experience, meaning they understand how to apply the 93 Annex A controls pragmatically across complex modern environments (such as cloud-native architecture, remote setups, and continuous integration pipelines).

4. Leadership in Standard Evolution (ISO 27001:2022)

BSI was among the very first certification bodies to secure UKAS accreditation for the ISO 27001:2022 update. They led the market in providing clear transition pathways, gap assessments, and guidance on key modern controls, such as threat intelligence, cloud services security, and environmental risk integration.

The Trade-Off: BSI’s rigour and brand cachet come at a premium; their audit fees are generally higher and their assessment process is more demanding than smaller certifiers. However, for organisations aiming to demonstrate top-tier security to high-value buyers, that rigour is precisely why BSI earns the top spot.

Accredited ISO 27001 Certification Bodies

All of the certification bodies presented on this list are ISO 27001 accredited certification bodies.

What are Accredited ISO 27001 Certification Bodies?

Accredited ISO 27001 certification bodies are independent third-party organisations that audit your Information Security Management System (ISMS) and issue official ISO/IEC 27001 certificates.

Crucially, to issue a globally recognised certificate, the certification body must be accredited by a national accreditation body that belongs to the International Accreditation Forum (IAF).

What Are ISO 27001 Accreditation Bodies?

While certification bodies are the ones that actually audit businesses and issue ISO 27001 certificates, ISO 27001 Accreditation Bodies are the authoritative, nationally recognised entities that audit and approve the certification bodies themselves.

Accreditation bodies are the answer to the question, who watches the watchers. The auditors of the auditors. They ensure that certification bodies maintain strict standards of competence, integrity, and impartiality.

Accreditation Bodies vs Certification Bodies

Feature / Attribute	Accreditation Body (AB)	Certification Body (CB)
Core Role	Audits and accredits certification bodies (“checkers of the checkers”).	Audits organisations/businesses and issues official ISO 27001 certificates.
Who They Audit	Certification bodies (audit firms and their auditor competence).	Businesses, tech companies, service providers, and institutions.
Primary Goal	Ensures auditors operate impartially, ethically, and to global standards.	Evaluates whether an organisation’s ISMS meets ISO/IEC 27001 requirements.
Governing Standard	ISO/IEC 17011 (Requirements for accreditation bodies).	ISO/IEC 17021-1 & ISO/IEC 27006 (Requirements for audit bodies).
Authority Level	Government-backed or sole designated national authorities.	Independent commercial or non-profit auditing organisations.
Global Oversight	Members of the International Accreditation Forum (IAF).	Accredited by IAF member National Accreditation Bodies.
Real-World Examples	UKAS (UK), ANAB (US), DAkkS (Germany), JAS-ANZ (Aus/NZ).	BSI, NQA, TÜV SÜD, SGS, Bureau Veritas, Schellman, DNV.
Certificate Output	Grants official accreditation status/mark to auditing firms.	Issues the accredited ISO 27001 certificate to your company.

Global ISO 27001 Accreditation Bodies Listed

Accreditation rules vary by country, but most major national bodies belong to the International Accreditation Forum (IAF) to ensure global trust and mutual acceptance.

Accreditation Body	Abbreviation	Country / Region
United Kingdom Accreditation Service	UKAS	United Kingdom
ANSI National Accreditation Board	ANAB	United States
Joint Accreditation System of Australia and New Zealand	JAS-ANZ	Australia & New Zealand
Deutsche Akkreditierungsstelle	DAkkS	Germany
Standards Council of Canada	SCC	Canada
China National Accreditation Service for Conformity Assessment	CNAS	China
Comité Français d’Accréditation	COFRAC	France
National Accreditation Board for Certification Bodies	NABCB	India
Ente Italiano di Accreditamento	ACCREDIA	Italy
Japan Accreditation Board	JAB	Japan
Raad voor Accreditatie	RvA	Netherlands
Entidad Nacional de Acreditación	ENAC	Spain
Singapore Accreditation Council	SAC	Singapore
Korea Accreditation Board	KAB	South Korea
General Coordination for Accreditation	CGCRE / INMETRO	Brazil
South African National Accreditation System	SANAS	South Africa
Swiss Accreditation Service	SAS	Switzerland
Entidad Mexicana de Acreditación	EMA	Mexico
Swedish Board for Accreditation and Conformity Assessment	SWEDAC	Sweden
Turkish Accreditation Agency	TÜRKAK	Turkey
Akkreditierung Austria	AA	Austria
Instituto Português de Acreditação	IPAC	Portugal

How to Check a Certification Bodies Accreditation Status

Verifying whether a Certification Body (CB) is genuinely accredited, or validating an ISO 27001 certificate issued by one, requires looking beyond the marketing copy on a website.

To ensure an auditor is qualified to issue an internationally recognised ISO/IEC 27001 certificate, you must follow the official verification hierarchy: Check the Certificate → Verify the Certification Body → Validate with the National Accreditation Body.

The Step-by-Step Verification Process

Step 1: Examine the Certificate for Required Marks

A valid, accredited ISO 27001 certificate must visually display specific details:

• The Certification Body Logo (e.g., BSI, NQA, TÜV SÜD)
• The Accreditation Body Logo (e.g., UKAS, ANAB, DAkkS)
• The IAF MLA Mark (International Accreditation Forum logo, proving global cross-border validity)
• Certificate Details: A unique certificate number, legal business name, physical address, issue/expiry dates, and the formal Scope of Certification.

Warning Sign: If a certificate only features the auditing company’s private logo without a recognised national accreditation mark (like UKAS or ANAB), it is likely an unaccredited certificate.

Step 2: Search Official Verification Databases

Never rely solely on a PDF printout or a website badge. Use official databases to verify active status:

Option A: Global Verification via IAF CertSearch

The IAF CertSearch database (iafcertsearch.org) is the central worldwide registry managed by the International Accreditation Forum.

• Enter the Company Name or Certificate Number.
• The portal checks in real time whether the certificate exists, whether the issuing Certification Body is accredited, and whether that accreditation body is an active IAF signatory.

Option B: Direct Verification via National Accreditation Bodies

If you want to verify that a specific Certification Body is legally authorised to issue ISO 27001 certificates in a specific region, search the national accreditation body’s official directory.

Step 3: Check the ISO/IEC 27001 Specific Scope

Holding accreditation for general ISO standards (like ISO 9001 Quality Management) does not automatically mean an auditor is accredited to assess Information Security.

When looking up a Certification Body on a national database (such as UKAS or ANAB):

1. Download their official Schedule of Accreditation (a legal PDF listing their approved technical competencies).
2. Look specifically for ISO/IEC 27001 (or ISO/IEC 27006 governing security management systems).
3. Confirm that their accreditation covers your specific industry sector (e.g., Software Development, Financial Services, Data Processing).

Red Flags of Non-Accredited “Certificate Mills”

To protect your business from spending money on a certificate that enterprise procurement teams will reject, look out for these common warning signs:

• Self-Auditing Conflict: A firm claims they can design/write your ISMS policies and conduct the final ISO 27001 certification audit themselves. ISO/IEC 17021-1 strictly forbids accredited bodies from offering implementation consultancy to audit clients.
• Instant Certification: They promise a fast-track certificate in under 7 days without conducting formal, separate Stage 1 (Documentation Review) and Stage 2 (Evidence & Controls Audit) phases.
• No Database Record: Missing IAF or National Accreditation logos on the final PDF, or the issuing body and certificate cannot be matched or validated against IAF CertSearch or national registries like UKAS CertCheck.

Always check an audit firm before you sign a deal. Follow these simple steps to make sure they are real and keep your business safe.

Does Accredited Certification Matter?

When preparing for ISO/IEC 27001, organisations often discover a vast difference in price, effort, and timeframe between different auditing firms. Some providers offer rapid, low-cost “ISO 27001 certificates” in a matter of days, while accredited audit firms require a rigorous, two-stage evaluation process.

The core difference comes down to accreditation. Simply put: Yes, accredited certification matters immensely. Obtaining an unaccredited ISO 27001 certificate often results in wasted budget, rejected enterprise proposals, and a false sense of security.

What Makes a Certificate “Accredited”?

An accredited certificate is issued by a Certification Body (CB) that has been independently evaluated and audited by a recognised national accreditation body (such as UKAS in the UK, ANAB in the US, or DAkkS in Germany).

Because these national bodies belong to the International Accreditation Forum (IAF) and sign the Multilateral Recognition Arrangement (MLA), an accredited ISO 27001 certificate carries universal, global trust across international borders.

Key Reasons Why Accredited ISO 27001 Certification Matters

1. Enterprise Buyers and Procurement Teams Will Inspect It

Major corporate clients, enterprise procurement departments, and government buyers do not accept ISO 27001 certificates at face value. During vendor risk assessments, third-party risk management (TPRM) teams routine check for:

• An official national accreditation mark (such as the UKAS Crown & Tick or ANAB logo).
• An active listing on the global IAF CertSearch database or national registers (like UKAS CertCheck).

If your certificate was issued by an unaccredited provider, enterprise clients will typically reject it and require you to complete extensive security questionnaires or undergo a third-party audit anyway.

2. Universal International Acceptance

Cross-border trade requires trust that translates globally. Thanks to the IAF MLA framework, a single UKAS-accredited or ANAB-accredited ISO 27001 certificate is recognised as equivalent in over 100 countries. An unaccredited certificate issued by a private local entity holds no regulatory or legal standing overseas.

3. Real Security Risk Reduction

ISO 27001 is designed to protect your organisation’s sensitive data, operational resilience, and customer trust. Accredited certification bodies follow strict standards (ISO/IEC 17021-1 and ISO/IEC 27006) to ensure auditors possess genuine information security expertise.

• Accredited Audits: Formally test your controls, interview risk owners, review technical evidence, and challenge your Information Security Management System (ISMS).
• Unaccredited “Cert Mills”: Frequently conduct superficial visual checks without testing technical efficacy, leaving critical vulnerabilities undiscovered.

4. Prevention of Conflicts of Interest

Under international accreditation rules, an accredited body is strictly prohibited from consulting on your ISMS implementation and then auditing you for certification. This strict separation guarantees complete objectivity and impartiality. Unaccredited providers frequently grade their own homework by selling implementation templates or coaching and then certifying their own work.

Comparing Accredited vs. Unaccredited ISO 27001 Certification

Evaluation Factor	Accredited ISO 27001 Certification	Unaccredited / Self-Issued Certificate
Independent Oversight	Overseen by government-backed national bodies (UKAS, ANAB, DAkkS).	None (issued by an independent private entity without oversight).
Enterprise Acceptance	Universally accepted by enterprise procurement & TPRM teams.	Frequently rejected during vendor risk evaluations.
Global Recognition	Recognised worldwide via the IAF Multilateral Recognition Arrangement.	Limited or non-existent outside the issuing entity.
Auditor Competence	Auditors are rigorously vetted, qualified, and peer-reviewed.	Varies widely; no mandatory qualification standards.
Verification Directory	Verifiable on IAF CertSearch and national databases.	Cannot be independently verified on national registries.
Commercial Value	High ROI; opens doors to enterprise deals and RFP requirements.	Low ROI; often requires re-auditing with an accredited body later.

How to Ensure You Are Getting an Accredited Audit

Before signing a contract with an auditing firm or certification body, take these three validation steps:

1. Ask for the Accreditation Mark: Confirm that the final certificate will bear an official IAF-recognised national accreditation mark (e.g., UKAS, ANAB, DAkkS).
2. Verify the Auditor’s Scope: Request their official Schedule of Accreditation to verify they are approved to issue certificates specifically under ISO/IEC 27001.
3. Check Impartiality: Ensure the certification body is not offering to write your policies or build your ISMS framework for you.

Further Reading

The ultimate guide to the Top 10 ISO 27001 Consultants

The ultimate guide to the Top 10 ISO 27001 Compliance Platforms

About the author