What is the name of the actor who voices Squidward Tentacles?

The actor who voices Squidward Tentacles is Rodger Bumpass.

Bumpass has voiced Squidward since SpongeBob SquarePants began, giving the character his distinctive nasal, monotone delivery and sudden bursts of exasperation. He also performs several incidental voices in the franchise and reprises Squidward in films, spin-offs, video games, and other related media.

Bumpass was born in Little Rock, Arkansas, on November 20, 1951. Before becoming known for animation, he trained in theater and worked in radio and television. His other notable voice roles include Professor Membrane in Invader Zim and The Chief in Where on Earth Is Carmen Sandiego?

Viewers sometimes confuse the main cast members because Tom Kenny voices SpongeBob, Bill Fagerbakke voices Patrick Star, and Clancy Brown voices Mr. Krabs. Squidward is also often mistakenly called a squid because of his name, but the character is officially an anthropomorphic octopus.