Shin-Marunouchi Building, 29th Floor
5-1, Marunouchi 1-Chome
Chiyoda-ku, Japan 100-6529
P 81-3-3214-6522
F 81-3-3214-6512

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Morrison & Foerster has the largest and most diverse practice of any international law firm in Japan, with over 120 attorneys in Tokyo (including 50 Japanese attorneys).

We were one of the first foreign law firms licensed in Japan, opening our offices in 1987. Today we are the largest international law firm in Japan (and one of the 6 largest firms in Japan, foreign or domestic).


  • Over 120 attorneys on the ground
  • Over 80 attorneys who are either Japanese or fluent in Japanese
  • Selected Japan International Law Firm of the Year by the Chambers Asia Pacific Awards in 2018, for the sixth consecutive year (and the seventh time in the eight years that the award has been presented)
  • Recognized by Chambers Asia Pacific 2018 in more Band 1 practice rankings and more "Star Individual" attorney rankings than any other international firm in Japan
  • Only global firm ranked Band 1 for M&A in Japan by Chambers Global, Chambers Asia Pacific, IFLR1000, and The Legal 500 Asia Pacific.
  • Asian Legal Business (ALB) Japan Law Awards 2017 honored us with four awards. We had transactions recognized as M&A Deal of the Year, TMT Deal of the Year, and Japan Deal of the Year. Further, Ken Siegel was named Managing Partner of the Year.
  • Ranked in Band 1 for Japan Intellectual Property in the 2018 edition of Chambers Asia Pacific
  • Ranked in Band 1 for Japan Capital Markets in the 2018 edition of IFLR1000
  • Exclusive winner for International Law Office's "Client Choice Award" for excellence in Litigation and Intellectual Property; ranked in Tier 1 for Japan Dispute Resolution by The Legal 500 Asia Pacific from 2005 - 2018
  • Ranked in Band 1 for Japan Real Estate in the 2018 editions of Chambers Asia Pacific and The Legal 500 Asia Pacific





Shin-Marunouchi Building, 29th Floor
5-1, Marunouchi 1-chome
Chiyoda-ku, Tokyo 100-6529
P 81-3-3214-6522
F 81-3-3214-6512

Managing Partner:
Kenneth Siegel  

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Winner 2017 Chambers Asia Pacific
Chambers Asia Pacific Names Morrison & Foerster Japan International Law Firm of the Year

“They are excellent. I've worked with multiple legal firms and they are the best.”

“They are the best in the market. They are very quick to respond and provide the best solutions to issues that come up.”
(Chambers Asia Pacific 2017)

“Morrison & Foerster is a one-stop shop with top-tier expertise.”

“Very high-quality service and are a client-oriented firm.”

“They're very good, and handle both US and Japanese law - different from many other firms.”
(Chambers Asia Pacific 2016)

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