A lazy river is a water ride found in water parks, hotels, resorts, and recreation centers, which usually consists of a shallow (2½ ft. to 3½ ft.) pool that flows similarly to a river. There is generally a slow current, usually just enough to allow guests to gently ride along lying on rafts. There may also be scenic elements added, such as small waterfalls on the edge of the river. Some lead into wave pools, while some just go around in circles.

"(Up A) Lazy River" is a popular tune and song by Hoagy Carmichael and Sidney Arodin, published in 1930. The melody is by Arodin, arranged and with words modified by Carmichael. It is considered a jazz standard and pop standard, and has been recorded by many artists. A bit of the song is played by Carmichael in the 1946 Oscar-winning film The Best Years of Our Lives.