Marcus David Maron (born September 27, 1963) is an American stand-up comedian, podcaster, writer, actor, and musician.

In the 1990s and 2000s, Maron was a frequent guest on the Late Show with David Letterman and has appeared more than forty times on Late Night with Conan O'Brien, more than any other stand-up comedian. He hosted Comedy Central's Short Attention Span Theater from 1993 to 1994, replacing Jon Stewart. He was also a regular guest on Tough Crowd with Colin Quinn and hosted the short-lived 2002 American version of the British game show Never Mind the Buzzcocks on VH1. He was a regular on the left-wing radio network Air America from 2004 to 2009, hosting The Marc Maron Show and co-hosting Morning Sedition and Breakroom Live.

In September 2009, following the cancellation of Breakroom Live, Maron began hosting the twice-weekly podcast WTF with Marc Maron, interviewing comedians, authors, musicians, and celebrities in his garage in Highland Park, Los Angeles. Highlights include a 2010 episode with Louis C.K. that was rated the No. 1 podcast episode of all time by Slate magazine, a 2012 interview with comedian Todd Glass in which Glass publicly revealed that he was gay, and a 2015 interview with President Barack Obama.

From 2013 to 2016, he starred in his own IFC television comedy series, Maron, for which he also served as executive producer and an occasional writer. From 2017 to 2019, he co-starred in the Netflix comedy series GLOW. He also had a minor role in 2019's Joker and provided the voice of Mr. Snake in the DreamWorks Animation film The Bad Guys (2022).