Brian Retterer (born 1972) is a retired American swimmer specialising in freestyle and backstroke events.

He is 1 of 2 swimmers in NCAA history that have won a national title in all 5 relays (Shawn Jordan is the other).

He was part of Stanford's recruiting class which was the greatest in swimming history, with Derek Weatherford, Tyler Mayfield, Eddie Parenti, Trip Zedlitz, Bill Schell, & Bob Eastlack.

He set the National Age Group record in the 17–18 in the 100 & 200 yard backstroke (when swimmers were required to touch the wall with their hands prior to a turn).

His career was mostly likely cut short due to nagging shoulder problems which forced him to red-shirt during college and have major surgery just before the Olympic Trials in 1996.