Bill Callahan (born June 3, 1966) is an American singer-songwriter, who has also recorded and performed under the band name Smog.

His early songs lacked melodic structure and were clumsily played on poorly tuned guitars, resulting in the dissonant sounds on his self-released cassettes and debut album Sewn to the Sky.

His use of lo-fi techniques was not primarily an aesthetic preference, but stemmed from his lack of resources to make and record music.

In this period he recorded two albums with the influential producer Jim O'Rourke and Tortoise's John McEntire, and collaborated with Neil Hagerty.

Callahan also worked closely with his then-girlfriend Cynthia Dall in his early career,[11] and they contributed vocals to each other's albums.

Themes in Callahan's lyrics include relationships, animals, relocation, nature, and more recently, politics.

In 2009, Callahan contributed cover songs on four separate tribute albums to Judee Sill, Kath Bloom, Chris Knox, and Merge Records.

In 2010, he released his first live album Rough Travel for a Rare Thing, which was recorded in 2007 at The Toff in Melbourne, Australia.

[22] It received favourable reviews, with Pitchfork contributing editor Jayson Greene referring to it as a "highlight of his career".

[31] In October 2014, a collection of ink drawings by Callahan and lyrics spanning his first album as Smog, to Dream River was released, titled I Drive a Valence.

His cover of Kath Bloom's "The Breeze/My Baby Cries" is featured in the fifth episode of the third series of Sex Education.