Coulrophobia is a fear of clown

Clown

Clowns are comic performers stereotypically characterized by the grotesque image of the circus clown's colored wigs, stylistic makeup, outlandish costumes, unusually large footwear, and red nose, which evolved to project their actions to large audiences. Other less grotesque styles have also...

s. The term is of recent origin, probably dating from the 1980s, and according to one analyst, "has been coined more on the Internet than in printed form because it does not appear in any previously published, psychiatric, unabridged, or abridged dictionary," however the author later notes, "regardless of its less-than-verifiable etymology, coulrophobia exists in several lists".