| Tungnafellsjokull(noun, name, volcano, geology) |
| Tungurahua(noun, name, volcano, geology) |
| Tunkin Depression(expression, name, volcano, geology, history) |
| Tupungatito(noun, name, volcano, geology) |
| Turrialba(noun, name, volcano, geology) |
| Tutuila(noun, name, volcano, geology) |
| Tutupaca(noun, name, volcano, geology) |
| Tuya volcanic field(expression, name, volcano, geology, history) |
| Tuzgle(noun, name, volcano, geology) |
| Tuzovsky(noun, name, volcano, geology) |
| Twin Cone(expression, name, volcano, geology, history) |
| Ubehebe Craters(expression, name, volcano, geology, history) |
| Ubinas(noun, name, volcano, geology) |
| Udina(noun, name, volcano, geology) |
| Udintsev Transform(expression, name, volcano, geology, history) |
| Udokan Plateau(expression, name, volcano, geology, history) |
| Ugashik-Peulik(noun, name, volcano, geology) |
| Uinkaret Field(expression, name, volcano, geology, history) |
| Uka(noun, name, volcano, geology) |
| Ukinrek Maars(expression, name, volcano, geology, history) |