Odd Nosdam (born David P. Madson) is a musician, DJ, artist, and co-founder and ex-art director of record label/collective Anticon.

Nosdam was first noticed for the drone and warped pop of his former group cLOUDDEAD (with fellow Anticon founders Why? and Doseone); he has worked closely with Mike Patton on his Peeping Tom project and remixed tracks by a variety of bands including The Notwist, Danielson, Serena-Maneesh, Boards of Canada, Bracken and Black Moth Super Rainbow. He has also produced, mixed or collaborated with Jel, Jessica Bailiff, Tunde Adebimpe, Restiform Bodies, Thee More Shallows, Themselves, Sole, Sage Francis, Boards of Canada, Dosh, Bre'r, Múm, Eluvium, Grouper, Saroos and Hood.