Captain Canuck is a Canadian comic book superhero. Created by cartoonist Ron Leishman and artist/writer Richard Comely, the original Captain Canuck first appeared in Captain Canuck #1 (July 1975). The series was the first successful Canadian comic book since the collapse of the nation's comic book industry following World War II.

Three characters have worn the maple leaf costume of Captain Canuck. The first Captain Canuck patrolled Canada in the then-future year of 1993, where "Canada had become the most powerful country in the world". He was the costumed agent of the "Canadian International Security Organization" (CISO). In 1995, Captain Canuck was honored with a Canadian postage stamp, along with Superman, Johnny Canuck, Fleur de Lys and Nelvana of the Northern Lights.

Like most independent comics, Captain Canuck's adventures have been published sporadically.

First published in 1975, Captain Canuck's original adventures were published on and off until 1981. There were several iterations since. Captain Canuck Reborn, Captain Canuck Unholy War (also called West Coast Canuck) and Captain Canuck Legacy.

In 2012, Richard Comely entered into a partnership with Toronto businessman, Fadi Hakim to relaunch a new, updated and modern version of Captain Canuck, which was designed in part by Kalman Andrasofszky (Marvel Comics). An animated series was crowd funded and it aired between 2013 & 2014. A second series of the animated adventures was set to air between 2015 & 2016. The first episode premiered at Hal-Con during Halloween.

Canuck's first appearance was in 1975, published by Comely Comix of Winnipeg, Manitoba. The story followed Tom Evans, a Canadian secret agent who gained superhuman strength from contact with extraterrestrials. This first version of the Canadian superhero ran for three issues before going on hiatus in 1976. In 1979, it came back, with Comely being backed by CKR Productions, and publishing 11 more issues, plus a summer special, concluding in early 1981; it was drawn mostly by George Freeman, taking over from Comely, who did the writing and lettering. He was pushed out of CKR after issue #12 was completed and issue #13 and #14 were outlined. The completed issue #15 (written and pencilled by George Freeman and inked, lettered and coloured by Claude St. Aubin) was finally published in 2004 as a limited edition by Comely.

Since the original, two newer incarnations of the Canadian icon have appeared: Comely launched a second version in 1993, under the imprint Semple Comics. Set in the present, Captain Canuck: Reborn featured a new Captain Canuck, Darren Oak, who fought a global conspiracy. This title lasted only four issues (#0–3) and was written and drawn by Richard Comely, Leonard Kirk and Sandy Carruthers with inks by Éric Thériault. That incarnation continued as a newspaper comic strip for a short while.

A third incarnation (sometimes called the "West Coast Captain Canuck"), edited by Comely but written and drawn by brothers Riel and Drue Langlois, appeared in 2004 under the banner of Comely Comics, entitled Captain Canuck: Unholy War. Yet another man, RCMP Constable David Semple, adopts the guise of Captain Canuck, to take on a biker gang called the Unholy Avengers. "Unholy War" was slated as a three-issue mini-series, the third and final installment being published in January 2005, but the series came out with a fourth issue (under the 'Hot Hail Comics' banner) in August 2007, which fully concluded the character. A trade paperback of the series was published in 2015 and reissued in 2023.