| Gerhard Thäter | |
| Birth Date: | 18 November 1916 |
| Birth Place: | Kiel |
| Death Place: | Wilhelmshaven |
| Allegiance: | (to 1945) |
| Branch: | |
| Serviceyears: | 1936–1945 to 1956–1960's |
| Rank: | Kriegsmarine (1936–1945): Kapitänleutnant Bundesmarine (1955–1960's): |
| Commands: | , June 1942 – August 1944 , October 1944 – May 1945 |
| Unit: | 3rd U-boat Flotilla 5th U-boat Flotilla 8th U-boat Flotilla 29th U-boat Flotilla |
| Battles: | World War II |
| Awards: | German Cross in Gold U-boat War Badge |
| Laterwork: | Diplomatic Naval attaché to Ottawa |
Gerhard Thäter (18 November 1916 in Kiel – 15 February 2004 in Wilhelmshaven) was a German naval officer.
Entering the Kriegsmarine in 1936 he served in the submarine branch and as commander of and saw action during the Second World War.
When the Federal Republic of Germany established her own armed forces in 1956, Thäter joined the Bundesmarine. In the course of his service he was made Naval Attaché to West Germany's embassy at Ottawa, Canada.
On 15 February 2004 Thäter died in Wilhelmshaven, Germany.
Gerhard Thäter's awards include the German Cross in Gold for repeated acts of bravery, the Iron Cross Second Class, and the U-Boat War Badge.