Dean Haglund is a Canadian actor, known for the role of Richard "Ringo" Langly, one of The Lone Gunmen on The X-Files. Haglund is also a stand-up comedian, specializing in improvisational comedy, including work with the Vancouver TheatreSports League. In addition to The X-Files, he played the voice of Sid in Tom Sawyer, Haglund also portrayed Langly in the spin-off The Lone Gunmen, which aired thirteen episodes in 2001. He is the inventor of the Chill Pak, a commercial external cooling product for laptop computers.

The Lone Gunmen are a trio of fictional characters, Richard "Ringo" Langly, Melvin Frohike and John Fitzgerald Byers, who appeared in recurring roles on the American television series The X-Files, and who starred in the short-lived spin-off, The Lone Gunmen. Their name was derived from the Warren Commission's conclusion that Lee Harvey Oswald was solely responsible for the assassination of John F. Kennedy.