ISO 27001 Auditor Rankings

Best ISO 27001 Auditors: 0 Firms Compared

ISO 27001 certification must come from an accredited certification body, and many teams pair it with SOC 2 to cover both markets. The 0 firms below have ISO 27001 work on record in the AuditNex directory — compare their profiles before you shortlist.

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How this list is ranked (as of July 26, 2026): independent verification status first, then relevance to this page, then profile completeness (credentials, pricing and timeline transparency, platform integrations), then verified client reviews. Ranking placement cannot be bought and firms do not pay to be listed. Independent verification of the directory is in progress — until a firm is verified, its data is compiled from public records and labeled accordingly. Full details: how we verify auditors.

Why there is no ranked list here yet

AuditNex only ranks firms we actually track for a framework. We have not yet confirmed ISO 27001 engagements for the firms in our directory, and we never fabricate a top-10. Use the criteria below to evaluate providers, or request matches and we will connect you through the network.

What to check before hiring an ISO 27001 auditor

Accredited certification body

Only an accredited certification body (e.g. ANAB or UKAS accredited) can issue the ISO 27001 certificate. Confirm accreditation and scope.

Stage 1 + Stage 2 plan

A credible auditor lays out both stages, the surveillance audit cadence, and the three-year recertification cycle up front.

SOC 2 crossover

If you also need SOC 2, a firm that handles both can reuse evidence and cut total audit effort significantly.

Sector experience

ISMS scoping differs a lot between SaaS, fintech, and hardware companies — ask for relevant certificates issued.

Frequently asked questions

Who can issue an ISO 27001 certificate?

Only an accredited certification body can issue an ISO 27001 certificate. Many audit firms also offer readiness assessments and internal audits, but the certificate itself must come from an accredited body — always confirm accreditation and its scope.

Can one firm do both my SOC 2 and ISO 27001?

Often yes. Many CPA firms with ISO 27001 practices (or certification-body partnerships) can run both engagements and reuse overlapping evidence, which typically lowers total cost and audit fatigue.

How were these ISO 27001 firms ranked?

By verification status, then profile completeness, then verified client reviews. AuditNex does not accept payment for placement; the methodology page documents every ranking signal.

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