Thomas Lehn (born 1958 in Fröndenberg) is a German piano and synthesizer player active in free improvisation and contemporary music.
Lehn studied sound engineering in Detmold and piano in Cologne. Since 1989, he played the analog synthesizer EMS Synthi A. Lehn has recorded with Marcus Schmickler, Keith Rowe, John Butcher, Phil Minton, Phil Durrant, Radu Malfatti, Axel Dörner, Cor Fuhler, Gerry Hemingway, and Andy Moor of The Ex. He is a member of the electronic orchestra M.I.M.E.O..
In 1997 Lehn formed a free improvisation band Konk Pack. They have released three CDs.