Jean-Marie Bayol (24 December 1849 – 3 October 1905) was a French army doctor, colonial administrator and politician.

[3] In 1880 he was assigned by Senegal Governor Louis Brière de l'Isle to Captain Joseph Gallieni's expedition in the Upper Niger region.

[3] Bayol left the naval health service after the Gallieni expedition and joined the colonial administration.

[3] In 1881-1882 Bayol and the artist and photographer Ernest Noirot explored part of the Rivières du Sud region of Senegal, which roughly corresponded to modern Guinea.

[3] The expedition aimed to promote trade with the French as an alternative to existing arrangements with British traders in Freetown, Sierra Leone.

[7] The Almamis of Futa Jallon, Ibrahima and Amadou, sent an embassy of five notables that accompanied Bayol and Noirot on their return journey to France in January 1882.

[3] On 12 October 1883, Bayol was made lieutenant-governor of Senegal, in charge of the Rivières du Sud region.

After returning to Kotonou on 31 December 1889 he dispatched two companies of troops, which made contact with the Dahomey forces on 19 February 1890.