Major John C. Cremony (1815 – August 24, 1879) was an American newspaperman who enrolled in the Massachusetts Volunteers in 1846, serving as a lieutenant. He served as a Spanish language interpreter for the U.S. Boundary Commission which laid out the Mexican and United States Border between 1849–1852. He went on to serve as Captain in Company B, 2nd Regiment California Volunteer Cavalry a unit of California Volunteers, with the California Column in New Mexico Territory. He eventually achieved the rank of Major in 1864 and commanded the 1st Battalion of Native Cavalry, California Volunteers until 1866. He was the first editor of San Francisco's Weekly Sunday Times newspaper.