Hiroyuki Tanaka
Mori Hamada & Matsumoto
Recognized since 2021
Tokyo, Japan
Practice Areas
Privacy and Data Security Law
Technology Law
- 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.
Contact & Links
- E-mail: hiroyuki.tanaka@mhm-global.com
- Direct Phone Number: +81-3-6266-8597
- Lawyer Page: https://www.mhmjapan.com/en/people/staff/709.html
Location
- Marunouchi Park Building 16th Floor
2-6-1 Marunouchi, Chiyoda-ku
Tokyo 100-8222
Japan
Languages
- English
- Japanese
Demographics
- Gender: Male
Education
- 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
Bar Admissions
- New York, New York State Bar Association, 2014
- Japan, Dai-ni Tokyo Bar Association, 2007
MH&M
Mori Hamada & Matsumoto
Headquarters:
Tokyo, Japan
3 The Best Lawyers in Japan™ awards
Named "Lawyer of the Year" by Best Lawyers® for:
- Privacy and Data Security Law, Tokyo, Japan (2025)
Recognized in The Best Lawyers in Japan™ 2025 for work in:
- Privacy and Data Security Law
- Technology Law
Awards:
- Lexology Index Global Elite Thought Leader Client Choice 2025 - Data
- Top 5 Best Performing Lawyer (as selected by companies) in the Data area by the “15th Corporate Legal Affairs and Lawyer Survey” published by Nikkei Inc.(Japan)
- Best Performing Lawyer in the Intellectual Property area by the “18th Corporate Legal Affairs and Lawyer Survey” published by Nikkei Inc.(Japan)
- IAM Patent 1000 – Japan (Litigation)
Additional Areas of Practice:
- Intellectual Property Law
- Information Technology Law
- Telecommunications Law
- Outsourcing
- Gaming Law
- Litigation
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
Recent Major Publications
- 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)
- Chambers Global Practice Guides Data Protection & Privacy - Japan Chapter (Co-authored, 2023)
- Mondaq Comparative Guides - Data Privacy - Japan Chapter (Co-authored, 2021)
- The Technology Disputes Law Review2nd Edition (Co-edited and co-authored,2022)
- Chambers Global Practice Guides Cybersecurity - Japan Chapter (Co-authored, 2023)
- Mondaq Comparative Guides Cybersecurity - Japan Chapter (Co-authored, 2020)
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