Auditor Directory
Top Compliance Auditors in Japan
About Japan Auditors
31 compliance audit firms with offices or operations in Japan. The list below covers the major frameworks assessed locally, the dominant firm sizes, and where the firms are concentrated. Use the filters to narrow by framework, firm size, or budget.
Frameworks most audited in Japan
Firm size mix
- Big 4
- 8
- Large (500+ staff)
- 16
- Mid-size (51–500)
- 6
- Boutique (≤50)
- 1
Top cities
- Tokyo
- 11
- London
- 8
- Brussels
- 1
- Paris
- 1
- Taipei
- 1
How to choose a Japan auditor
- Scope match: confirm the firm has signed off audits for the framework you need in the last 12 months.
- Local presence: on-site evidence collection and interviews are faster when the auditor has staff in your city.
- Three quotes: for identical scopes, pricing can vary two to three times across the firms listed here.
- References: ask for one reference customer in your industry and company stage.
Top Compliance Auditors in Japan is one of many regions in the global auditor directory. To find auditors by framework, see the framework-based directory.
31 firms — interactive filtering loads below.
BDO International
Brussels, Belgium
BDO is the fifth-largest professional services network globally, providing audit, tax, and advisory services through member firms in over 160 countries.
BSI Group
London, UK
BSI Group is the world's first national standards body and largest ISO certification body, offering ISO 27001, ISO 27701, SOC 2, and Cyber Essentials audits globally.
BSI Group
London, United Kingdom
BSI Group is the world's leading standards and certification body, providing ISO 27001, ISO 22301, and other management system certifications globally.
Bureau Veritas
Paris, France
Bureau Veritas is a world-leading testing, inspection, and certification company providing ISO 27001 and management system certifications in 140+ countries.
Deloitte
London, United Kingdom
Deloitte is the world's largest professional services firm, offering audit, assurance, tax, and advisory services across 150+ countries worldwide.
Deloitte Tohmatsu
Tokyo, Japan
Deloitte Tohmatsu is Deloitte's Japanese member firm and one of Japan's largest audit firms, providing Big Four services including J-SOX and ISMAP compliance.
DNV
Oslo, Norway
DNV is a global assurance and risk management company providing ISO 27001, ISO 22301, and management system certifications across 100+ countries worldwide.
Ernst & Young (EY)
London, United Kingdom
EY is a Big Four professional services firm providing audit, assurance, tax, consulting, and strategy services across more than 150 countries worldwide.
EY Japan
Tokyo, Japan
EY Japan (EY ShinNihon) provides Big Four audit, assurance, and advisory services with expertise in J-SOX, ISMAP, and Japanese regulatory compliance.
Grant Thornton
London, United Kingdom
Grant Thornton is a leading global professional services network providing audit, tax, and advisory services through member firms in over 140 countries.
KPMG
Amstelveen, Netherlands
KPMG is a Big Four professional services firm providing audit, tax, and advisory services through a global network spanning 143 countries and territories.
KPMG AZSA LLC
Tokyo, Japan
KPMG AZSA (KPMG Japan) is a Big Four audit firm providing SOC 2, ISO 27001, APPI, ISMAP, and enterprise risk advisory services to Japan's largest corporations across technology, manufacturing, and financial services.
Kroll
New York, New York
Kroll is a global risk and financial advisory firm providing cybersecurity, compliance, and investigation services with deep expertise in digital forensics.
LAC Co., Ltd.
Tokyo, Japan
LAC is one of Japan's largest cybersecurity firms offering ISO 27001, ISMS, and PCI DSS assessments.
LRQA
London, United Kingdom
LRQA is a global assurance and certification provider specializing in ISO 27001, ISO 22301, cybersecurity, and management system certifications worldwide.
NRI SecureTechnologies
Tokyo, Japan
NRI SecureTechnologies is a leading Japanese cybersecurity firm offering ISO 27001, PCI DSS, and ISMS assessments.
PricewaterhouseCoopers (PwC)
London, United Kingdom
PwC is one of the Big Four professional services firms, providing audit, assurance, tax, and consulting services to major organizations in 152 countries.
Protiviti
Menlo Park, California
Protiviti is a global consulting firm specializing in internal audit, risk management, and compliance with 9,000+ professionals across 25+ countries.
PwC Aarata LLC
Tokyo, Japan
PwC Aarata (PwC Japan) is a Big Four audit firm providing SOC 2, ISO 27001, APPI, ISMAP, and enterprise risk advisory services to Japan's leading corporations across financial services, technology, and manufacturing.
SGS
Geneva, Switzerland
SGS is the world's largest testing, inspection, and certification company, providing ISO 27001 and management system certifications across 140+ countries.
TCS (Tata Consultancy Services)
Mumbai, India
TCS is India's largest IT services company offering cybersecurity, compliance audit, and risk advisory services to enterprises across 46 countries worldwide.
TUV Rheinland
Cologne, Germany
TUV Rheinland is a world-leading German certification and testing body providing ISO 27001, TISAX, and management system certifications across 60+ countries.
TUV SUD
Munich, Germany
TUV SUD is a leading German testing, inspection, and certification body providing ISO 27001, TISAX, and management system certifications across 50+ countries.
BDO Japan
Tokyo, Japan
BDO Japan is a mid-market audit and advisory firm providing ISO 27001, SOC 2, APPI, and P-Mark compliance services to mid-market companies and foreign-invested businesses operating in Japan.
CyCraft Technology
Taipei, Taiwan
CyCraft Technology is a Taiwanese AI cybersecurity firm offering ISO 27001 and SOC 2 assessments.
GMO Cybersecurity
Tokyo, Japan
GMO Cybersecurity offers ISO 27001, P-Mark, and PCI DSS assessments for Japanese technology companies.
Intertek
London, United Kingdom
Intertek is a global quality assurance provider offering ISO 27001, ISO 22301, and management system certifications through operations in 100+ countries.
JISC/JAB Accredited Certification Bodies
Tokyo, Japan
JISC/JAB is Japan's national accreditation body for ISO certification bodies, ensuring ISO 27001 and management system certifications meet international standards.
JQS
Tokyo, Japan
JQS is a Japanese accredited certification body specializing in ISO 27001 and quality management system certifications for Japanese organizations.
Macnica Cybersecurity
Yokohama, Japan
Macnica Cybersecurity is a Japanese firm offering ISO 27001, PCI DSS, and ISMS assessments.
SOMPO Cyber Security
Tokyo, Japan
SOMPO Cyber Security provides ISO 27001 and SOC 2 assessments for Japanese enterprises.