Albert Gallatin Riddle (May 28, 1816 – May 16, 1902) was a U.S. Representative from Ohio.
Born in Monson, Massachusetts, Riddle moved with his parents to Newbury, in the Western Reserve of Ohio, in 1817. He completed preparatory studies, and then studied law. He was admitted to the bar in 1840 and began practice in Geauga County, serving as prosecuting attorney of that county 1840-1846. He served as member of the Ohio House of Representatives 1848-1850, and in 1848 called the first Free Soil convention in Ohio.