Long Day's Journey into Night is a drama in four acts written by American playwright
Eugene O'Neill in 1941–42 but first published in 1956. The play is widely considered to be his masterwork and
magnum opus. The play premiered in Sweden in February 1956 and then opened on
Broadway in November 1956, winning the
Tony Award for Best Play. The play has been revived on Broadway several times, notably in 1986 with Jack Lemmon, 1988 with Jason Robards and Colleen Dewhurst, and 2003 with Vanessa Redgrave.