| Joachim de Knagenhielm | |
| Birth Date: | 1727 5, df=y |
| Birth Place: | Kaupanger, Norway |
| Death Place: | Bodø, Norway |
| Citizenship: | Norway |
| Nationality: | Norwegian |
| Profession: | Politician |
| Office: | Governor of Nordland |
| Term Start: | 1771 |
| Term End: | 1789 |
| Predecessor: | Peter Holm |
| Successor: | Christian Torberg Hegge |
| Office2: | Governor of Nordre Bergenhus amt |
| Term Start2: | 1763 |
| Term End2: | 1771 |
| Successor2: | Magnus Theiste |
Joachim de Knagenhielm (1727–1796) was a Norwegian civil servant and politician from the noble Knagenhjelm family. He served as the first County Governor of Nordre Bergenhus county from 1763 until 1771. He was then appointed as the County Governor of Nordland county from 1771 until his retirement in 1789.[1]