Daniel Patrick Harrington Jr. (August 13, 1929 – January 6, 2016) was an American Emmy Award–winning stage and television actor, best known for his role as building superintendent Dwayne Schneider on the sitcom One Day at a Time (1975–1984).

During the Korean War, Harrington served as an intelligence officer with the U.S. Air Force, where he achieved the rank of first lieutenant.

Harrington became known in the 1950s as a member of Steve Allen's television comedy troupe, "Men on the Street"[6] (which included Don Knotts, Tom Poston and Louis Nye).

He made many appearances as the comedic Italian immigrant golf pro Guido Panzini on The Jack Paar Show in the mid-1950s.

In the 1964–1965 television season, he guest-starred on numerous programs, including the sitcom The Bing Crosby Show and Kentucky Jones (starring Dennis Weaver).

[8] On April 6, 1965, Harrington appeared in an episode of Mr. Novak (starring James Franciscus) titled "There's a Penguin in My Garden.

From 1971 to 1974, he appeared in 11 episodes as District Attorney Charlie Giannetta of the ABC legal drama Owen Marshall: Counselor at Law, starring Arthur Hill in the title role.

He played Hank Vosmik, a crew member who wins the heart of Florence Henderson's character Diane DeMarco in The Love Boat S2E11 "Captain's Cup", 1978.