| Terpuk(noun, name, volcano, geology) |
| Theistareykir(noun, name, volcano, geology) |
| Three Sisters(expression, name, volcano, geology, history) |
| Ticsani(noun, name, volcano, geology) |
| Tidore(noun, name, volcano, geology) |
| Tigalalu(noun, name, volcano, geology) |
| Tigre(noun, name, volcano, geology) |
| Tilocalar(noun, name, volcano, geology) |
| Tin Zaouatene Volcanic Field(expression, name, volcano, geology, history) |
| Tinakula(noun, name, volcano, geology) |
| Tindfjallajokull(noun, name, volcano, geology) |
| Tinguiririca(noun, name, volcano, geology) |
| Tipas(noun, name, volcano, geology) |
| Titila(noun, name, volcano, geology) |
| Tjornes Fracture Zone(expression, name, volcano, geology, history) |
| Tlevak Strait-Suemez Island(expression, name, volcano, geology, history) |
| Toba(noun, name, volcano, geology) |
| Tobaru(noun, name, volcano, geology) |
| Todoko-Ranu(noun, name, volcano, geology) |
| Todra Volcanic Field(expression, name, volcano, geology, history) |