| Office: | Mayor of Kristiansand |
| Term Start: | 8 May 1945 |
| Term End: | 31 December 1945 |
| Predecessor: | O. A. Fosby |
| Successor: | Karl Rosenløv |
| Term Start2: | 1 January 1937 |
| Term End2: | 31 December 1940 |
| Predecessor2: | Einar Jørgensen |
| Successor2: | Anders Kjær |
| Office3: | Member of the Norwegian Parliament |
| Term Start3: | 1 January 1931 |
| Term End3: | 31 December 1936 |
| Constituency3: | Market towns of Vest-Agder and Rogaland counties |
| Term Start4: | 1 January 1913 |
| Term End4: | 31 December 1918 |
| Constituency4: | Baneheia |
| Office5: | President of the Odelsting |
| Term Start5: | 1917 |
| Term End5: | 31 December 1918 |
| Successor5: | Ole M. Mjelde |
| Office6: | Minister of Defence |
| Term Start6: | 20 February 1919 |
| Term End6: | 17 June 1919 |
| Primeminister6: | Gunnar Knudsen |
| Predecessor6: | Christian T. Holtfodt |
| Successor6: | Ivar Aavatsmark |
| Birth Name: | Rudolf Elias Peersen |
| Birth Date: | 28 April 1868 |
| Birth Place: | Kristiansand, Vest-Agder, Sweden-Norway |
| Death Place: | Kristiansand, Vest-Agder, Norway |
| Party: | Liberal |
Rudolf Elias Peersen (28 April 1868 - 5 February 1949) was a Norwegian lawyer and politician.
Peersen was born in Kristiansand on 28 April 1868, the son of Jens P. Peersen and Tomine Margrethe Ommundsen. He studied law at the University of Kristiania from 1888 to 1892. He became active in politics on the left, both locally and nationally. He was a member of Kristiansand city council at various times from 1905 to 1945, including being mayor from 1938 to 1940 and again in 1945. He represented Kristiansand in the national parliament from 1913 to 1919, briefly serving as Minister of Defence for a few months in 1919. He served as a member of the parliament again from 1930 to 1936.[1] He was a member of the Norwegian Association for Women's Rights.[2]