- theodolite
- Theodoric the Great
- Theodosius
- Theodosius II
- Theoretical Archaeology Group
- theory
- thermae
- thermal fracture
- thermo-remnant magnetism
- thermoluminescence dating
- Thetford ware
- Theudelinda
- Thiessen polygons
- thimble
- thin orange ware
- thin section
- thing
- Third Intermediate Period
- Thoeris
- tholos
- Thom, Alexander
- Thompson, Sir John Eric Sidney
- Thomsen, Christian Jürgensen
- Thoth
- Thothmes
- Thracians
- Three Age System
- three-dimensional recording
- threshing floor
- through-room
