Stephen Coffin (1807 – 1882) was an investor, promoter, builder, and militia officer in mid-19th century Portland in the U.S. state of Oregon. Born in Maine, he moved to Oregon City in 1847, and in 1849 he bought a half-interest in the original Portland townsite. In 1863, after Coffin provided a steamboat for sending troops up the Columbia River to fight in the Yakima War, Oregon Governor Addison Gibbs made him a brigadier general in the state militia. Coffin died in Dayton, Oregon, on March 16, 1882.