Sinmun of Silla (r. 681–692) was the thirty-first king of Silla, a Korean state that originated in the southwestern Korean peninsula and went on to unify most of the peninsula under its rule in the mid 7th century. He was the eldest son of Silla's unifier-king, Munmu and Queen Jaeui. Sinmun's reign may be characterized by his attempts to consolidate royal authority following unification and to reorganize and systematize the governing apparatus of the newly enlarged Silla state.