Mark J. Green, American lawyer and politician
Mark Joseph Green (born March 15, 1945) is an American author, former public official, public interest lawyer and Democratic politician from New York City. He worked with Ralph Nader from 1970 to 1980, eventually as director of Public Citizen's Congress Watch, and was president of Air America Radio from 2007 to 2009. His 2001 campaign for mayor of New York is chronicled in the 2002 Sundance film Off the Record: The 9/11 Election.

In 2016 Green published his 23rd book, Bright, Infinite Future: A Generational Memoir on the Progressive Rise (St Martin's Press). He has co-written two bestsellers, Who Runs Congress? (1972) (co-written with James Fallows) and The Book on Bush (2004) (co-written with Eric Alterman). He has collaborated on several books with Nader (The Closed Enterprise System, 1972; Monopoly Makers, 1974; Verdicts on Lawyers, 1975; and Taming the Giant Corporation, 1976). Another recent book is Change for America: A Progressive Blueprint for the 44th President, co-edited by Green and Michele Jolin, a transition policy book for President Obama co-produced by the New Democracy Project and the Center for American Progress Action Fund. He was a Visiting Scholar at NYU College and Law School from 2002 to 2006.

Green hosted the nationally syndicated radio show Both Sides Now from 2010 to 2016. It aired on 200 stations and was recorded at IHeartMedia in New York City. The weekly program rotated such regular panelists as Arianna Huffington, Ron Reagan, Bob Shrum, Jonathan Alter, as well as Kellyanne Conway, Mary Matalin, David Frum, and Rich Lowry.. In February 2017 Green founded and ran the Twitter handle @ShadowingTrump, consisting of 21 leading national progressive scholars and former officials.

Green was New York City Consumer Affairs Commissioner from 1990 to 1993 and was elected New York City Public Advocate in 1993 and 1997. He won Democratic primaries for the U.S. House of Representatives, U.S. Senate, and mayor of New York City, in each case losing the general election.