Alf Collett (8 August 1844-12 June 1919) was a Norwegian writer and historian.
Alf Collett was born at Eidsvoll in Akershus, Norway. He attended Oslo Cathedral School. He was the second son of professor Peter Jonas Collett (1813-1851) and Camilla Collett (1813-1895). His maternal uncles included Oscar and Henrik Wergeland, and his paternal uncles included Peter Severin Steenstrup. He had one older brother Robert, a notable zoologist, and two younger brothers. He married Mathilda Sophie Kallevig (1845-1915), but they did not have any children.
He published many historical and genealogical works, the most important being En gammel Christiania-slægt. Optegnelser om familien Collett og Christianias fortid (1883) and Gamle Christiania-Billeder (1893).
[[Category:People from Eidsvoll