Wes Wilson (born July 15, 1937) is an American artist and one of the leading designers of psychedelic posters.
Best known for designing posters for Bill Graham of The Fillmore in San Francisco, he invented a style that is now synonymous with the peace movement, psychedelic era and the 1960s.
In particular, he is known for inventing and popularizing a "psychedelic" font around 1966 that made the letters look like they were moving or melting.
His style was heavily influenced by the Art Nouveau movement.
Wilson is considered to be one of "The Big Five" San Francisco poster artists, along with Alton Kelley, Victor Moscoso, Rick Griffin, and Stanley Mouse.