Term | Explanation |
| Taifun | Typhoon - Operational code name for the German push towards Moscow - September 1941. |
| Ten-Go | Operational code name for the Japanese naval operations at Okinawa and Iwo Jima beginning April 1945. |
| Terminal | Code name for the Allied conference in Potsdam - July 1945. |
| Thunderclap | Operational code name for the Allied bombing of Dresden - February 1945. |
| Tidal Wave | Operational code name for the US bombing of the Romanian oilfields of Ploesti - August 1943. |
| Tiger | 1 - Operational code name for the German advance through the Maginot Line on the French border - June 1940. 2 - Operational code name for a British convoy to Egypt in May 1941 |
| Torch | Operational code name for the Allied landings in North West Africa - November 1942. |
| Totalize | Operational code name for the Canadian advance towards Falaise, France - August 1944. |
| Trident | Code name for the third Allied conference in Washington - May 1943. |
| Tripartite Pact | Formal agreement of alliance between Germany, Italy and Japan - an expansion of the Axis nations - signed 27th September 1940. |