Ralph Theodore Breyer (February 23, 1904 – May 8, 1991) was an American competition swimmer and Olympic champion.

After graduating from Lane Technical High School, he received a swimming scholarship from Northwestern University in 1921.

He won a gold medal as a member of the first-place world record breaking U.S. team in the men's 4×200-meter freestyle relay event.

The relay team consisted of members Harry Glancy, Wally O'Connor, Johnny Weissmuller, Dick Howell and Breyer, while other members of the US team included brothers Sam and Duke Kahanamoku.

[2] At Northwestern University, Breyer led his team to two NCAA and three Big Ten championships.