| Abbreviation | Definition |
|---|---|
| TN | Tunisia |
| TO | Tonga |
| TP | East Timor |
| TPE | Chinese Taipei |
| TR | Turkey |
| TRNC | Turkish Republic of Northern Cyprus |
| TT | Taco Tuesday |
| TT | Trinidad and Tobago |
| TV | Tuvalu |
| TW | Taiwan |
| TW | Tchaj Wan |
| TWN | Taiwan |
| TYN | Tyndall |
| TZ | Tanzania |
| TZA | Tanzania |
| TZK | Tajikistan |
| UA | Ukraine |
| UA | Upper Austria |
| UAE | United Arab Emirates |
| UAR | United Arab Republic |