| Hans Howaldt | |
| Birth Date: | 12 November 1888 |
| Birth Place: | Kiel, German Empire |
| Death Place: | Bad Schwartau, West Germany |
| Allegiance: | |
| Serviceyears: | 1907–1918 and 1939–1945 |
| Rank: | Kapitän zur See |
| Branch: | |
| Unit: | Flandern Flottille, Zeebrugge, and in 1939 a unit of minelayers in the Baltic Sea, including Kattegat and Skagerrak |
| Battles: | U-boat Campaign (World War I) |
| Awards: | Iron Cross House Order of Hohenzollern Pour le Mérite Hanseatic Cross War Merit Cross |
| Relations: | His grandfather August Howaldt was the builder of the first German submarine Brandtaucher. |
Hans Howaldt (12 November 1888, Kiel – 6 September 1970) was a successful and highly decorated German U-boat commander in the Kaiserliche Marine during World War I and also active in World War II. By the end of World War I he was promoted Kapitänleutnant.
As a sportsman, Hans Howaldt won Bronze in the international 8 Metre class sailing at the 1936 Summer Olympics on the Bay of Kiel as skipper of Germania III, a keelboat designed and built by Abeking & Rasmussen and owned by crew-member Alfried Krupp von Bohlen und Halbach.