徐勉465年 - 535年，字修仁，南朝东海郡郯城人。

父徐融为南昌相，徐勉幼时为孤儿，贫而好学，在南齐为太学博士，镇军参军。后来跟随梁武帝萧衍，被梁武帝信任。任为中书侍郎，建威将军。在南梁升进侍中、吏部尚书、左仆射、中书令。他博通经史，善辞令，建议武帝统一礼制，修订五礼（吉、凶、军、宾、嘉），梁朝的典章朝仪、婚冠吉凶之礼，徐勉都参与制定。立梁律，起国子学、州郡学校教育子弟，鼓励培养官吏。为官勤于职事，清正无和，不经营产业，被当时的人所称道。他日夜在官署办公，经常数十天不回家，家里养的狗都不认识他的了。每当他回家，群犬惊吠，他叹息说：「吾忧国忘家，乃至于此。」徐勉任吏部尚书时，曾经和门人在晚间聚会。一个门人想求徐勉任他为官，徐勉说：「今夕止可谈风月，不宜及公事。」大同元年十一月去世。享年七十岁。武帝闻报流泪，车驾临席葬礼。赠光禄大夫，赐东园秘器、朝服、钱帛，諡号简肃。徐勉为人清廉，日常生活质素，自称人遗子孙以财，我遗子孙以清白。

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Xu Mian (徐勉) (466–535), courtesy name Xiuren (修仁), formally Duke Jiansu (简肃公, 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 (徐长宗) 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 (萧懿), 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.