Sark (French: Sercq; Sercquiais: Sèr) is a small feudal island in the southeastern English Channel. It is one of the Channel Islands, and is part of the Bailiwick of Guernsey. It has a population of 610 as of 2002.

Sark is an evil computer program, one of the main characters in the film Tron. He was played by David Warner in said film and voiced by Corey Burton in Kingdom Hearts II.

Susan Ariel Rainbow Kennedy, better known as SARK, is a speaker, artist and author of inspirational, motivational self-help books characterized by lively and colorful drawings and watercolors.

Sark is a planet in Isaac Asimov's Foundation universe, featureded in the novel The Currents of Space.

A shirt.

To cover with sarking, or thin boards.