Alf Martinius Lagesen (24 June 1897 – 13 February 1973) was a Norwegian footballer who played as a goalkeeper for Drammens BK and the Norwegian national team. Lagesen played one international match, a friendly in 1920 against Sweden in Stockholm. He was in the Norwegian squad at the Antwerp Olympics the same year where he was reserve goalkeeper behind Sigurd Wathne. Lagesen was also a referee and officiated the 1921 Norwegian Football Cup final. He was later chairman of Drammens BK.