Xu Mian (徐勉) (466–535), courtesy name Xiuren (脩仁), formally Duke Jiansu (簡肅公, literally "the undiscriminating and solemn duke"), was an official of the Chinese dynasty Liang dynasty. He was never titular prime minister, but was largely considered a de facto prime minister and well regarded by his contemporaries.

Xu Mian's grandfather Xu Zhangzong (徐長宗) was an officer under Emperor Wu of Liu Song, and his father Xu Rong (徐融) was a commandery governor. However, the Xu family was not rich. When he was young, Xu Mian became known for studiousness, and he was retained by Southern Qi's prime minister Wang Jian to serve as an assistant. Wang was impressed by Xu's abilities, and often stated that he had the capability to become prime minister. Around this time, Xu also befriended the army officer Xiao Yi (蕭懿), who later became a general.

In 502, Xiao Yi's brother Xiao Yan forced Emperor He of Southern Qi to yield the throne to him, establishing Liang as its Emperor Wu. Having known Xu from the time when Xu and Xiao Yi were friends, Emperor Wu made him a mid-level official. After the prime minister Fan Yun died in 503, Emperor Wu entrusted the important matters of state to Xu and Zhou She, effectively making them co-prime ministers, even though neither carried the title and neither received particularly high rank.

As de facto prime minister, Xu was considered to be capable, diligent, and honest. He often spent nights at his office, rather than his house—so much so that when he went home, his dogs would not recognize him and would bark at him. During his service, Xu also authored works designed to reestablish the formality of funeral mournings. He did not care for storing wealth, and whenever he had possessions, he would give them to the poorer members of his clan.

In 524, Xu Mian's second son Xu Fei (徐悱) died, and Xu Mian was so distressed that he tried to resign his post, but Emperor Wu would not let him. Also in 524, Zhou She died, and thereafter Xu handled prime minister duties alone. By 531, however, his resignation on account of illness appeared to have been accepted, as his posts from that point on appeared honorary. He died in 535, and both Emperor Wu and his crown prince Xiao Gang personally mourned Xu. Xu was awarded the posthumous name "Duke Jiansu," even though there is no record that Emperor Wu ever created him a duke while he was alive or posthumously.

徐勉465年 - 535年，字修仁，南朝東海郡郯城人。

父徐融為南昌相，徐勉幼時為孤兒，貧而好學，在南齊為太學博士，鎮軍參軍。後來跟隨梁武帝蕭衍，被梁武帝信任。任為中書侍郎，建威將軍。在南梁昇進侍中、吏部尚書、左僕射、中書令。他博通經史，善辭令，建議武帝統一禮制，修訂五禮（吉、凶、軍、賓、嘉），梁朝的典章朝儀、婚冠吉凶之禮，徐勉都參與制定。立梁律，起國子學、州郡學校教育子弟，鼓勵培養官吏。為官勤于職事，清正無和，不經營產業，被當時的人所稱道。他日夜在官署辦公，經常數十天不回家，家裡養的狗都不認識他的了。每當他回家，群犬驚吠，他嘆息說：「吾憂國忘家，乃至于此。」徐勉任吏部尚書時，曾經和門人在晚間聚會。一個門人想求徐勉任他為官，徐勉說：「今夕止可談風月，不宜及公事。」大同元年十一月去世。享年七十歲。武帝聞報流淚，車駕臨席葬禮。贈光祿大夫，賜東園秘器、朝服、錢帛，諡號簡肅。徐勉為人清廉，日常生活質素，自稱人遺子孫以財，我遺子孫以清白。

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