A barnacle is a sessile marine animal.

Barnacle(s) may also refer to: Barnacle (surname) Barnacle (comics), a character from Marvel Comics Barnacle (parking), a device that prevents drivers from operating illegally parked vehicles Barnacle (slang), an electronic part manually installed onto a printed circuit board to correct a functional deficiency Barnacle, Warwickshire, a small hamlet in Warwickshire, England Seborrheic keratosis, a non-cancerous benign skin growth, known as the "barnacles of old age" "Barnacle", a 2021 song by Limp Bizkit from Still Sucks "Barnacles", a 2002 song by Ugly Casanova from Sharpen Your Teeth Captain Barnacles, a character from Octonauts

See also The Barnacle Historic State Park, a Florida State Park Barnacle goose, a species of bird Barnacle Boy, a SpongeBob SquarePants character