Michael Dean Cohen (born August 25, 1966) is an American lawyer who served as an attorney for Donald Trump, the 45th and 47th president of the United States, from 2006 to 2018. Cohen served as vice president of the Trump Organization and personal counsel to Trump, often being described as his fixer. Cohen served as co-president of Trump Entertainment and was a board member of the Eric Trump Foundation, a children's health charity. From 2017 to 2018, Cohen was deputy finance chairman of the Republican National Committee.

Trump employed Cohen until May 2018, a year after the special counsel investigation into Russian interference in the 2016 U.S. elections began. In August 2018, Cohen pleaded guilty to eight counts including campaign-finance violations, tax fraud, and bank fraud. Cohen said he violated campaign-finance laws at Trump's direction "for the principal purpose of influencing" the 2016 presidential election. In November 2018, Cohen pleaded guilty to lying to U.S. congressional committees about efforts to build a Trump Tower in Moscow.

In December 2018, Cohen was sentenced to three years in federal prison and ordered to pay a $50,000 fine. In February 2019, the New York Supreme Court, Appellate Division, disbarred him from practicing law in the state. In May 2019, he reported to the federal prison near Otisville, New York. In November 2021, he completed his sentence.

In early 2019, Cohen sued the Trump Organization for allegedly failing to reimburse his legal fees; in July 2023, the parties reached a settlement ahead of a planned trial. In early 2023, Trump sued Cohen for allegedly breaching his legal trust; in October 2023, Trump dropped the suit ahead of a planned deposition.

Cohen was raised in the town of Lawrence on Long Island, New York. His mother was a nurse, and his father, a Holocaust survivor, was a surgeon. Cohen is Ashkenazi Jewish. He attended Woodmere Academy and received his BA from American University in 1988 and his JD from Thomas M. Cooley Law School in 1991.

Cohen began practicing personal injury law in New York in 1992, working for Melvyn Estrin in Manhattan.

In 2006, Cohen was a partner at the law firm Phillips, Nizer, Benjamin, Krim & Ballon. He practiced law at the firm for about a year before joining The Trump Organization. Following his 2018 felony convictions, Cohen was disbarred in New York.

In 2003, Cohen was a candidate for New York City Council when he provided a biography to the New York City Campaign Finance Board for inclusion in its voters' guide. The guide listed him as co-owner of Taxi Funding Corp. and a fleet of New York City taxicabs numbering over 200. At the time, Cohen was a business partner in the taxi business with "taxi king" Simon Garber. He was also CEO of MLA Cruises, Inc., and of the Atlantic Casino. As of 2017, Cohen was estimated to own at least 34 taxi medallions through 17 limited liability companies (LLCs). Until April 2017, another "taxi king", disbarred attorney and convicted felon Gene Freidman, managed the medallions still held by Cohen; this arrangement ended after the city's Taxi and Limousine Commission decided not to renew Freidman's licenses. Between April and June 2017, the New York State Department of Taxation and Finance filed seven tax warrants against Cohen and his wife for $37,434 in unpaid taxi taxes due to the Metropolitan Transportation Authority.