Leyendecker is the surname of several people:
Ulrich Leyendecker (b. 1946), German composer of contemporary classical musicFrank Xavier Leyendecker (1877–1924), American illustrator (younger brother of J. C. Leyendecker)Joseph Christian Leyendecker (1874–1951), American illustrator (older brother of F.X. Leyendecker)Leyendecker may also refer to
"Leyendecker", a track by Battles from their 2007 album, Mirrored