威廉·萨默塞特·毛姆，CH（英语：William Somerset Maugham，1874年1月25日－1965年12月16日），英国现代小说家、剧作家。

毛姆生于巴黎的英国大使馆，八岁时母亲去世，悲伤的毛姆遂把她的一幅相片保留在床边直到自己逝世；十岁时父亲劳伯特·奥蒙得·毛姆（大法官）亦去世，他继承了一笔每年300镑的遗产。

毛姆于坎特伯雷国王学校毕业后入海德堡大学学习。后来因为染上肺疾而前往法国南方里维耶拉疗养，开始阅读法国作家的作品，

1897年医科毕业后毛姆成为妇产科医生，并以自己的经验创作了第一部长篇小说《兰贝斯的丽莎》（Liza of Lambeth）。此后弃医从文，毛姆开始写作，一写就七十年。《人性的枷锁》（Of Human Bondage）是毛姆的代表作，带有自传色彩。

William Somerset Maugham CH (/ˈmɔːm/ MAWM; 25 January 1874 – 16 December 1965) was a British playwright, novelist and short story writer. He was among the most popular writers of his era and reputedly the highest paid author during the 1930s.

After losing both his parents by the age of 10, Maugham was raised by a paternal uncle who was emotionally cold. Not wanting to become a lawyer like other men in his family, Maugham eventually trained and qualified as a physician. The initial run of his first novel, Liza of Lambeth (1897), sold out so rapidly that Maugham gave up medicine to write full-time.