Square Peg or Square Pegs may refer to:
Square Pegs, a 1982–1983 American TV series
"Square Pegs" (song), a 1982 song by The Waitresses that served as the TV show's theme song
Square Pegs (Hong Kong TV series), a 2003 Hong Kong TV series
"Square peg in a round hole", an idiomatic expression
The Square Peg, a 1958 British comedy film
"Square Peg" (King of the Hill), a 1997 television episode
Square Peg (production company), an American production company founded by filmmaker Ari Aster and producer Lars Knudsen