| Alf Lagesen | |
| Fullname: | Alf Martinius Lagesen |
| Birth Date: | 24 June 1897 |
| Position: | Goalkeeper |
| Clubs1: | Drammens BK |
| Nationalyears1: | 1920 |
| Nationalteam1: | Norway |
| Nationalcaps1: | 1 |
| Nationalgoals1: | 0 |
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.[1] He was in the Norwegian squad at the Antwerp Olympics the same year where he was reserve goalkeeper behind Sigurd Wathne, but he did not play in any matches.[2]
Lagesen was also a referee and officiated the 1921 Norwegian Football Cup final.[3] He was later chairman of Drammens BK.[4]