Doing time is slang for spending time in a jail or prison.
It may also refer to: Doing Time (manga), a 1998 manga written by Kazuichi Hanawa Doing Time (2002 film), also Keimusho no Naka, a 2002 Japanese live-action film based on the manga by Kazuichi Hanawa Doing Time: Life Inside the Big House, a 1991 documentary film We're All Doing Time, a book by Bo Lozoff Doing Time, the US title of 1979 British film Porridge "Doing Time", an episode from the third season of SpongeBob SquarePants "Doing Time", a song by Bad Religion from the 1982 album How Could Hell Be Any Worse? "Doing Time", a song by Avenged Sevenfold from the 2013 album Hail to the King "Doing Time", a song by MxPx from the 1996 album Life in General
See also Doing Time, Doing Vipassana, a 1997 Israeli documentary film "Doing Time with Ron Kuby", an American talk radio show syndicated by Air America Media