Yu Wenjun (Chinese: 庾文君; 297– March or April 328, formally Empress Mingmu (明穆皇后, literally "the understanding and solemn empress") was an empress of the Chinese Jin dynasty by marriage to the Emperor Ming. She served as regent during the minority of her son Emperor Cheng from 2 November 325 to early March 328, when the capital Jiankang fell to Su Jun and Emperor Cheng became Su's captive.