[[Image:Humpback underwater.jpg|right|thumb|250px|Li baleni immiruti sunnu canusciuti pî soi canti.]]
A '''whale song''' is the collection of [[sound]]s made by [[whale]]s to [[animal communication|communicate]]. The word "[[song]]" is used in particular to describe the pattern of predictable and repetitious sounds made by certain species of whales (notably the [[humpback whale]]) in a manner that to [[cetology|cetologists]] is reminiscent of [[human]] singing.
The biological processes used to produce sound vary from one family of cetaceans to another. However, all [[whales]], [[dolphin]]s, and [[porpoise]]s are much more dependent on sound for communication and sensation than their terrestrial cousins because the absorption of [[light]] by water makes [[sight]] difficult and because the relatively slow movement of water compared to air decreases the effectiveness of the sense of [[smell]]. Increased ambient noise in the world's oceans due to shipping gives rise to environmentalists' concerns that humans are destroying this important feature of the marine habitat.
[[Image:Dolphin head sound production.PNG|right|300px|thumb|Idealized dolphin head showing the regions involved in sound production. This image was redrawn from Cranford (2000).]]