Outsider music is music created by self-taught or naïve musicians. The term is usually applied to musicians who have little or no traditional musical experience, who exhibit childlike qualities in their music, or who have intellectual disabilities or mental illnesses. The term was popularized in the 1990s by journalist and WFMU DJ Irwin Chusid.

Outsider art is art made by self-taught individuals who are untrained and untutored in the traditional arts with typically little or no contact with the conventions of the art worlds.