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| Headquarters | San Francisco |
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| No. of offices | 19 (2026) |
| No. of attorneys | 1,021 (2025) |
| Key people | Eric McCrath (Chair) |
| Revenue | US$1.54 billion (2025) |
Morrison & Foerster LLP (also known as MoFo) is an American multinational law firm headquartered in San Francisco, California. As of February 2026, the firm had 19 offices worldwide.
Morrison & Foerster was founded in San Francisco in 1883.
In 1960, it had one office and fewer than 25 lawyers. During the 1960s, its lawyers began working with emerging Silicon Valley technology companies. By 1999, it had more than 675 lawyers in 15 offices across six countries.
The firm expanded to other California cities during the 1970s.
In 1974 the firm expanded outside San Francisco and opened an office in Los Angeles to better meet the needs of longtime client Crocker National Bank.
Soon after, the firm expanded again, opening an office in Washington, D.C. in 1979 and its first non-U.S. office in London in 1980.
In 1987 the firm merged with New York-based litigation company Parker Auspitz and opened its Tokyo office.
The firm merged again in 1991, this time with Ciotti & Murashige. A decade later, Morrison & Foerster became one of the largest international law firms in Tokyo when it merged with Ito & Mitomi.
In September 2013, it announced plans to open in Berlin by recruiting the office of Hogan Lovells, including nine partners. It had opened a Singapore office earlier that year.
Later in 2013, the German team advised Axel Springer on its acquisition of N24 Media.
In 2022 Morrison & Foerster was a founding member of the Legal Alliance for Reproductive Rights, a coalition of United States law firms offering free legal services to people seeking and providing abortions.
In February 2026, the firm opened an office in Seattle after recruiting a litigation team from Perkins Coie.
The firm was the lead bankruptcy counsel to Residential Capital (ResCap). Its Chapter 11 liquidation plan was confirmed.
In July 2013 Morrison & Foerster represented SoftBank in its $21.6 billion acquisition of a 78 percent stake in Sprint Nextel.
The firm represented Sandoz in a 2017 Supreme Court case concerning the notice required before marketing biosimilar drugs. In February 2018, it represented Uber in the settlement of Waymo’s trade-secret lawsuit. Its corporate work included advising Intel on the $15.3 billion acquisition of Mobileye.
In 2015, Law360 reported that the firm's charitable foundation had donated about $45 million since 1986.
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In 2018, female lawyers sued the firm, alleging discrimination relating to sex, pregnancy and maternity leave. The firm denied discriminating against the plaintiffs. Five plaintiffs settled in 2020; the remaining two settled in March 2022.
In 2023, the American Alliance for Equal Rights sued over eligibility restrictions in the firm’s diversity fellowship. The firm subsequently opened eligibility to applicants of all races. The group voluntarily dismissed its lawsuit in October. The firm said revisions had already been underway.
In September 2025, the firm agreed to pay £25,000 plus legal costs to a trans man and the Good Law Project, without admitting liability. They had alleged discrimination after its London office declined to act following an initial agreement to provide representation. The firm denied that its decision was discriminatory or connected to political events in the United States.
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