Alexis Bidagan dit St-Martin (April 8, 1802[a] – June 24, 1880) was a Canadian voyageur who is known for his part in experiments on digestion in humans, conducted on him by the American Army physician William Beaumont between 1822 and 1833.

[3] On June 6, 1822, St-Martin was accidentally shot with a musket at close range at the fur trading post on Mackinac Island.

The charge of the musket shot left a hole through his side that healed to form a fistula aperture into his stomach.

Beaumont recalls the chores St-Martin did: "During this time, in the intervals of experimenting, he performed all the duties of a common servant, chopping wood, carrying burthens, etc.

[1]: 296 When Alexis St-Martin died at Saint-Thomas, Quebec, in 1880 his family delayed his burial until the body began to decompose in order to prevent his "resurrection" by medical men, some of whom wished to perform an autopsy.

[3] Alexis Bidagan dit St-Martin is buried at Saint-Thomas Parish Cemetery in Joliette, Quebec, Canada.

[9] The eminent physician Sir William Osler took a great interest in retracing the details of this early incident in the history of gastric physiology and published his research in the form of a well-known essay entitled A Backwoods Physiologist.