Robert John Wagner (born February 10, 1930) is an American film and television actor of stage and screen, who starred in movies, soap operas and television.

Wagner starred in three American television series that spanned three decades: as playboy-thief-turned-secret-agent, Alexander Mundy, in It Takes a Thief (It Takes a Thief (1968 TV series)) (1968-1970), as Eddie Alberts ex-con man turned crime-fighting partner, Det. Pete T. Ryan, in the con-artist-oriented drama Switch (Switch (TV series)) (1975-1978), and as Stefanie Powerss super-rich husband and private-eye partner, Jonathan Hart, in the lighthearted crime drama Hart to Hart (1979-1984). In movies, Wagner is known for his role as Number Two (Number 2 (Austin Powers)) in the Austin Powers films of the late 1990s and early 2000s. He also had a recurring role as Teddy Leopold on the TV sitcom Two and a Half Men.

Wagners autobiography, Pieces of My Heart: A Life, written with author Scott Eyman, was published on September 23, 2008.