摇摆乐（英语：Swing music）是1930年代早期发源于美国的一种音乐类型，至1935年已形成独特的风格。摇摆乐依靠由低音大提琴和鼓组成的节奏组来支撑旋律组（旋律组包含小喇叭、伸缩喇叭等铜管乐器、萨克斯风、单簧管等木管乐器，有时也会加入小提琴、吉他等弦乐器。）节拍速度大致多为中等至轻快，带有摇摆的节奏感。

音乐之所以称为「摇摆乐」，是由于音乐强调小节里的下半拍或弱拍，因而带来摇摆的感觉。摇摆乐乐团通常会有独奏乐手为编制好的音乐加上即兴演奏。

1935年至1945年称为「摇摆年代」（Swing Era），在各大乐团以及古德曼（Benny Goodman）等乐团领班的演奏下，可供跳舞的摇摆乐称霸当时的美国流行乐坛。

Swing music, or simply swing, is a form of American music that developed in the early 1930s and became a distinctive style by 1940. Swing uses a strong rhythm section of double bass and drums as the anchor for a lead section of brass instruments such as trumpets and trombones, woodwinds including saxophones and clarinets, and sometimes stringed instruments such as violin and guitar, medium to fast tempos, and a "lilting" swing time rhythm. The name swing came from the phrase ‘swing feel’ where the emphasis is on the off–beat or weaker pulse in the music. Swing bands usually featured soloists who would improvise on the melody over the arrangement. The danceable swing style of big bands and bandleaders such as Benny Goodman was the dominant form of American popular music from 1935 to 1946, a period known as the Swing Era. The verb "to swing" is also used as a term of praise for playing that has a strong rhythmic "groove" or drive.