Allen Kelsey Grammer (born February 21, 1955) is an American actor, producer, and singer. He gained fame for his role as the psychiatrist Dr. Frasier Crane on the NBC sitcom Cheers (1984–1993) and its spin-off Frasier (1993–2004, and again from 2023 to 2024). With more than 20 years on air, this is one of the longest-running roles played by a single live-action actor in primetime television history. He has received numerous accolades, including a total of six Emmy Awards, three Golden Globe Awards, a Screen Actors Guild Award and a Tony Award.

Grammer, having trained as an actor at Juilliard and the Old Globe Theatre, made his professional acting debut as Lennox in the 1981 Broadway revival of Macbeth. The following year, he portrayed Cassio acting opposite Christopher Plummer and James Earl Jones in Othello. In mid-1983, he acted alongside Mandy Patinkin in the original off-Broadway production of Stephen Sondheim's musical Sunday in the Park with George. He has since starred in the leading roles in productions of Sweeney Todd: The Demon Barber of Fleet Street, My Fair Lady, Big Fish, and Finding Neverland.