Rear Admiral John Marshall Bowyer (June 19, 1853 – March 15, 1912) was an officer in the United States Navy.

[1] Bowyer was born in Cass County, Indiana; and in 1870, he was appointed to the United States Naval Academy from Iowa.

[1] Ensign Bowyer served aboard the ship Michigan attached to the Northwestern Lake station.

[1] For the next three years, Bowyer was attached to the North Atlantic Station, serving on the cruisers Detroit and Raleigh, and the ill-fated battleship Maine.

[1] At the outbreak of the Spanish–American War, Bowyer was assigned as executive officer aboard the gunboat Princeton: and from 1898 through 1901, he served on the Yorktown.