| Martin Kristjansen | |
| Realname: | Martin Kristjansen |
| Weight: | Lightweight |
| Nationality: | Danish |
| Birth Date: | 12 November 1977 |
| Birth Place: | Slagelse, Denmark |
| Style: | Orthodox |
| Total: | 27 |
| Wins: | 21 |
| Losses: | 2 |
| Draws: | 4 |
| No Contests: | 0 |
| Ko: | 6 |
Martin Kristjansen (born 12 November 1977) is a Danish lightweight boxer from Slagelse, Denmark. He is a former WBO inter-continental lightweight champion.
Kristjansen was ranked first in the WBO Lightweight rankings when he fought the third ranked British Lightweight Amir Khan on 5 April 2008 in a title eliminator. After an onslaught from Khan in the seventh round, the referee stopped the fight with the Dane unable to defend himself.