Long Day's Journey into Night is a play by Eugene O'Neill.
Long Day's Journey into Night may also refer to:
Films Long Day's Journey into Night (1962 film), American adaptation Long Day's Journey into Night (1996 film), Canadian adaptation Long Day's Journey into Night (2018 film), Chinese film unrelated to the play Long Day's Journey into Night (2025 film), 2025 adaptation
Television episodes "Long Day's Journey into Night" (ITV Sunday Night Theatre), 1973 British television adaptation "Long Day's Journey into Night", 1986 season 2 Growing Pains episode "Long Day's Journey into Night", 2014 season 2 Devious Maids episode "Long Day's Journey", 2003 season 4 Angel episode