Thomas Francis Gleeson (born 2 June 1974) is an Australian stand-up comedian, writer, television and radio presenter. Gleeson currently hosts Hard Quiz and Taskmaster Australia and previously co-hosted The Weekly with Charlie Pickering alongside Judith Lucy.

In 2019, Gleeson won the Gold Logie Award for Most Popular Personality on Television.

Gleeson was born in Gunnedah, New South Wales, and lived at nearby Tambar Springs before boarding at St. Joseph's College, Hunters Hill, in Sydney. He graduated from the University of Sydney with a Bachelor of Science in mathematics and physics. During his degree, Gleeson played the drums and occasionally sang vocals in an Australian band, The Fantastic Leslie, before leaving for a career in comedy.

Gleeson's first stage appearance was as the character "Malcolm" (for two years) dressed in a flannelette shirt, tracksuit pants and a wig. He later went on to perform at major comedy events including the Melbourne International Comedy Festival, Sydney Comedy Festival, Adelaide Fringe, Brisbane Comedy Festival, Perth Fringe World, Edinburgh Fringe and Montreal Comedy Festival.

In December 2007, Gleeson entertained Australian troops on active duty in Iraq and Afghanistan. He wrote of this experience in his book Playing Poker with the SAS: A comedy tour of Iraq and Afghanistan, which was published in October 2008.

Three of Gleeson's stand-up shows have been nominated for the Helpmann Award for Best Comedy Performer: Tom On! (2007), Up Himself (2011) and Quality (2014).

Gleeson’s stand up show Joy (2019) won Best Comedy at Perth Fringe World.

Gleeson’s stand up show Lighten Up (2020) also won Best Comedy at the Adelaide Fringe.