TBD
- Douglas TBD Devastator
- TBA (disambiguation)
- TBD (TV network)
- TBD Records
- TBD TV
- TBD.com
- Three Bridges railway station
- Three Busy Debras
- Throwing Copper
- Timbiqui Airport
- To be decided
- To be declared
- To be defined
- To be determined
- To be discussed
- To be done
- Torpedo boat destroyer
- Track-before-detect
- Triazabicyclodecene