Leyendecker is the surname of several people:
- Ulrich Leyendecker (b. 1946), German composer of contemporary classical music
- Frank 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
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