无伴奏合唱（意大利语：a cappella；中文音译：阿卡贝拉 或阿卡佩拉）即纯人声合唱，常见于15和16世纪的教堂音乐，亦有组合利用这种形式来重新编排流行音乐。在外国比较著名的无伴奏团体有国王合唱团、史温格歌手、Take 6、真实之声、Pentatonix、VoicePlay、New York Voices、The Manhattan Transfer以及日本的The Gospellers。这种音乐风格的小组近年也流行于香港，台湾和日本。例如台湾2013年金曲奖的最佳演唱组合奖得主欧开合唱团就是无伴奏合唱的合唱团。

A cappella [a kapˈpɛlla] (Italian for "in the manner of the chapel") music is specifically group or solo singing without instrumental accompaniment, or a piece intended to be performed in this way. It contrasts with cantata, which is accompanied singing. The term "a cappella" was originally intended to differentiate between Renaissance polyphony and Baroque concertato style. In the 19th century a renewed interest in Renaissance polyphony coupled with an ignorance of the fact that vocal parts were often doubled by instrumentalists led to the term coming to mean unaccompanied vocal music. The term is also used, albeit rarely, as a synonym for alla breve.