| Office: | Minister of Defence |
| Term Start: | 11 April 1908 |
| Term End: | 20 August 1909 |
| Primeminister: | Gunnar Knudsen |
| Predecessor: | Thomas Heftye |
| Successor: | August Spørck |
| Birth Date: | 5 October 1854 |
| Birth Place: | Løten, Hedmark, United Kingdoms of Sweden and Norway |
| Death Place: | Christiania, Norway |
| Spouse: | Bolette Sophie Lowzow [1] |
| Party: | Liberal |
| Allegiance: |  Norway |
| Branch: | Norwegian Army |
| Serviceyears: | 1872 - 1915 |
| Rank: | Inspector-General of the Infantry |
Haakon Ditlev Lowzow (5 October 1854 – 12 August 1915) was a Norwegian military officer and politician for the Liberal Party. He is best known as the Norwegian Minister of Defence from 1908 to 1909.
Lowzow was born in Kristiania,[2] and came from a military background. His father was a lieutenant, his grandfather was a major general and his great-grandfather was a lieutenant general. Also, he was a granduncle of Carl Fredrik and Wenche Lowzow.[3]
He became a military officer in 1872, and was promoted to premier lieutenant in 1887 and lieutenant colonel in 1904. On 11 April 1908, when the first cabinet Knudsen assumed office, he was appointed as the new Minister of Defence. He held this position until 19 August 1909, when he resigned. He later became major general of rank and Inspector-General of the Infantry. He died in August 1915.[2]