| Office: | Minister of Labour |
| Term Start: | 3 March 1933 |
| Term End: | 20 March 1935 |
| Primeminister: | J. L. Mowinckel |
| Predecessor: | Rasmus Langeland |
| Successor: | Johan Nygaardsvold |
| Term Start2: | 15 February 1928 |
| Term End2: | 12 May 1931 |
| Primeminister2: | J. L. Mowinckel |
| Predecessor2: | Magnus Nilssen |
| Successor2: | Rasmus Langeland |
| Term Start3: | 25 July 1924 |
| Term End3: | 5 March 1926 |
| Primeminister3: | J. L. Mowinckel |
| Predecessor3: | Cornelius Middelthon |
| Successor3: | Anders Venger |
| Term Start4: | 22 June 1921 |
| Term End4: | 6 March 1923 |
| Primeminister4: | Otto Blehr |
| Predecessor4: | Cornelius Middelthon |
| Successor4: | Cornelius Middelthon |
| Term Start5: | 10 May 1920 |
| Term End5: | 21 June 1920 |
| Primeminister5: | Gunnar Knudsen |
| Predecessor5: | Martin Olsen Nalum |
| Successor5: | Cornelius Middelthon |
| Office6: | Minister of Provisioning |
| Term Start6: | 22 June 1921 |
| Term End6: | 23 July 1921 |
| Primeminister6: | Otto Blehr |
| Predecessor6: | Johan H. R. Holmboe |
| Successor6: | Rasmus Mortensen |
| Office7: | Member of the Norwegian Parliament[1] |
| Term Start7: | 1 January 1922 |
| Term End7: | 31 December 1936 |
| Constituency7: | Hordaland |
| Term Start8: | 1 January 1907 |
| Term End8: | 31 December 1921 |
| Constituency8: | Voss |
| Birth Date: | 12 September 1865 |
| Birth Place: | Osterøy, Hordaland, United Kingdoms of Sweden and Norway |
| Death Place: | Osterøy, Hordaland, Norway |
| Spouse: | [2] |
| Children: | 14[3] |
| Party: | Liberal |
Ole Monsen Mjelde (12 September 1865 – 7 March 1942) was a Norwegian politician of the Liberal Party who served as the Minister of Labour 1920, 1921–1923, 1924–1926, 1928–1931 and 1933–1935, and also as head Ministry of Provisioning in 1921.[4]