Mark Hart (born July 2, 1953, Fort Scott, Kansas), is a multi instrumentalist best known for his stints as a member of Supertramp and Crowded House.

A student of classical music, Mark worked as a full time musician, doing various session stints with known artists, notably the group Supertramp. He began his association with Supertramp in 1987 as a studio and touring session musician. Mark Hart shared the same manager as the band Crowded House, and was suggested as a session musician for the band after their difficulties replacing keyboardist Eddie Rayner.

He contributed to Woodface in 1991 as a session musician, later joining the band fully a while after Tim Finn left, and is credited as a full member on Together Alone from 1993. He stayed with the band after founding drummer Paul Hester left, he is seen along with Neil Finn and Nick Seymour in the photographs from the sleeve for Recurring Dream, the 1996 greatest hits album. Mark Hart played with the band during their farewell concert on the steps of the Sydney Opera House in November 1996, known as Farewell to the World.

Following the demise of the group, Hart stated that he thought the band had more in them. He would later join Neil Finn on stage for some of his solo concerts supporting Finn's debut solo album Try Whistling This in 1998, before rejoining Supertramp, producing for Tim Finn and releasing his own album Nada Sonata, in 2002.

In January 2007, Neil Finn announced that he would be reforming Crowded House with Nick Seymour, Mark Hart and a new drummer, confirmed in February as former Beck drummer Matt Sherrod, releasing a new album (Time on Earth) and embarking on a year-long world tour. The album was initially intended to be Finn's third solo album, but was converted to a Crowded House album late in the sessions. As a result, Hart contributed on only seven songs to the new album. Both he and Sherrod are slated to fully contribute to the next album, according to Neil Finn, to go into production at the end of 2007.

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