Privacy and Data Security Law Technology Law
Hiroyuki Tanaka
Recognized in Best Lawyers since 2021 
Firm
Mori Hamada
164 Best Lawyers awards
Awarded Practice Areas
Biography
- Hiroyuki Tanaka is a Partner of Mori Hamada & Matsumoto, practicing data, IP, IT, and AI law.
- He is the Adjunct project professor at Keio University Graduate School of Law and Member of the Cyber-Physical Sustainability Center of Keio University Global Research Institute
- He has extensive experience advising foreign clients on Japanese data protection law. He is also familiar with global data protection regulations, including GDPR and CCPA / CPRA and helps Japanese clients with global data protection compliance by working closely with local counsels.
- His practice area includes legal issues relating to AI, including generative AI and the protection of cybernetic avatars.
- He has extensive experience for various IP infringement disputes as well as disputes related to IT including software and apps.
Firm
Mori Hamada
164 Best Lawyers awards
Overview
- English
- Japanese
- Gender: Male
- New York University, LL.M. in Competition, Innovation, and Information Law, graduated 2013
- Keio University Law School, J.D., graduated 2006
- Keio University, LL.B, graduated 2004
- New York, New York State Bar Association, 2014
- Japan, Dai-ni Tokyo Bar Association, 2007
- English
- Japanese
- New York, New York State Bar Association, 2014
- Japan, Dai-ni Tokyo Bar Association, 2007
- New York University, LL.M. in Competition, Innovation, and Information Law, graduated 2013
- Keio University Law School, J.D., graduated 2006
- Keio University, LL.B, graduated 2004
- Gender: Male
Client Testimonials
Awards & Focus
Named "Lawyer of the Year" by Best Lawyers® for:
- Privacy and Data Security Law, Tokyo, Japan (2025)
Recognized in The Best Lawyers in Japan™ 2026 for work in:
- Privacy and Data Security Law
- Technology Law
Additional Areas of Practice:
- Intellectual Property Law
- Information Technology Law
- Telecommunications Law
- Outsourcing
- Gaming Law
- Litigation
Awards:
- Lexology Index Global Elite Thought Leader Client Choice 2025 - Data
- One of 2024’s top 3 best-performing AI, Tech, and Data lawyers (as selected by companies) in Nikkei’s corporate legal affairs and lawyer survey of the Japanese market.
- One of 2022’s Best Performing Lawyers in the Intellectual Property area in Nikkei’s corporate legal affairs and lawyer survey of the Japanese market.
- IAM Patent 1000 – Japan (Litigation)
Additional Information
- Other Positions
- Adjunct project professor at Keio University Graduate School of Law (2023-)
- Member of the Cyber-Physical Sustainability Center of Keio University Global Research Institute (2023-)
- Advisor to Japan DPO Association (2019-)
- Recent Major Publications
- The Global Legal Post - Data Protection Comparative Guide – Japan Chapter
- Chambers Global Practice Guides Data Protection & Privacy - Japan Chapter (Co-authored, 2025)
- Mondaq Comparative Guides - Data Privacy - Japan Chapter(Co-authored, 2025)
- Chambers Global Practice Guides Cybersecurity - Japan Chapter(Co-authored, 2025)
- Mondaq Comparative Guides Cybersecurity - Japan Chapter (Co-authored, 2025)
- The Legal 500: Artificial Intelligence Country Comparative Guide 2024 - Japan Chapter(Co-authored, 2024)
- What does Japan‘s External Data Transmission Rule mean?(Co-authored, 2023)
- Practical notes for Japan's important updates of the APPI guidelines and Q&As (Co-authored, 2022)
- Practical notes for Japan's amended APPI: How to amend privacy notices (Co-authored, 2021)
- The Technology Disputes Law Review2nd Edition (Co-edited and co-authored,2022)
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