| Lars Abrahamsen | |
| Office: | Minister of Social Affairs |
| Term Start: | 1 October 1916 |
| Term End: | 20 February 1919 |
| Primeminister: | Gunnar Knudsen |
| Predecessor: | Kristian Friis Petersen |
| Successor: | Paal Berg |
| Office2: | Minister of Justice |
| Term Start2: | 31 January 1913 |
| Term End2: | 26 July 1916 |
| Primeminister2: | Gunnar Knudsen |
| Predecessor2: | Fredrik Stang |
| Successor2: | Andreas Urbye |
| Office3: | Minister of Trade |
| Term Start3: | 19 March 1908 |
| Term End3: | 2 February 1910 |
| Primeminister3: | Gunnar Knudsen |
| Predecessor3: | Sofus Arctander |
| Successor3: | Sofus Arctander |
| Birth Name: | Lars Kristian Abrahamsen |
| Birth Date: | 18 October 1855 |
| Birth Place: | Hedrum, Vestfold, United Kingdoms of Sweden and Norway |
| Death Place: | Christiania, Norway |
| Nationality: | Norwegian |
| Party: | Liberal |
| Profession: | Lawyer |
Lars Kristian Abrahamsen (18 October 1855 – 21 July 1921) was a Norwegian politician for the Liberal Party. A district stipendiary magistrate by profession, he served in Gunnar Knudsen's first and second cabinets (1908–1910 and 1913–1920). He was Minister of Trade 1908–1910, Minister of Justice 1913–1916, and Minister of Social Affairs 1916–1919. Abrahamsen resigned on 20 February 1919.