Søren Lerby (born 1 February 1958) is a Danish former football player, manager, and licensed agent. As a player, he spent most of his career in Dutch football, winning five Eredivisie championships with Ajax Amsterdam and two with PSV Eindhoven. With the latter club, he also won the 1988 European Cup. He won two Bundesliga titles with Bayern Munich, and played one season for AS Monaco in France.

He played 67 matches for the Denmark national football team from 1978 to 1989, and represented Denmark at the 1986 FIFA World Cup and two European Championship tournaments. Currently, he is the agent of Galatasaray winger Dries Mertens.

Lerby was born in Copenhagen, the son of former Danish under-21 football international Kaj Lerby.

Lerby played his youth football with local clubs B 1903, Taastrup IK and Fremad Amager. He got his senior debut with Fremad Amager, playing 13 games and scoring three goals in the top-flight 1975 1st Division season. He and Fremad Amager teammate Frank Arnesen moved abroad to become professional footballers in November 1975.

They switched to the Dutch club Ajax Amsterdam, when Lerby was only 17 years old. Lerby’s first home game was a 4–1 against Go Ahead Eagles on 11 April 1976. He won three Dutch Eredivisie league titles in his first six years at Ajax, in the 1976–77, 1978–79, and 1979–80 seasons. In the summer of 1981 he was named team captain, succeeding newly departed Frank Arnesen. In the two seasons Lerby was captain, Ajax won a further two Dutch championships with high goal differences.

He moved to Germany in 1983, replacing midfielder Paul Breitner at Bayern Munich. He remained there for three years, winning two German Bundesliga championships and two DFB-Pokal cup trophies. His career continued for French team AS Monaco from 1986 to 1987.

Lerby moved back to the Netherlands in 1987 and was reunited with Frank Arnesen at Ajax’ rivals PSV Eindhoven. He was a part of the 1988 European Cup winning PSV squad, also including fellow Danes Jan Heintze and Ivan Nielsen, though Frank Arnesen missed the final against S.L. Benfica because of injury. Lerby ended his active career in 1990.

Between 9 October 1991 and 11 March 1992, he spent some time as coach with Bayern Munich, as successor of Jupp Heynckes. With a spell of undistinguished results, including a combined 6–3 UEFA Cup elimination by his former club B 1903, Lerby effectively ended his managerial career and became a FIFA-licensed sports agent (Essel Sports Managements).