4T
# 4T

4T or 4-T may refer to:

## Biology and chemistry

* 4-T-TRIS; see Thiotrisescaline
* 4-t-butylpyrocatechol; see 4-tert-Butylcatechol
* 4T-MMDA-2; see MMDA

## Locomotives

* 4T class of locomotive
* LMS Stanier 2-6-4T (disambiguation)
* LMS 3-Cylindered Stanier 2-6-4T
* LMS Fairburn 2-6-4T
* LMS Fowler 2-6-4T
* Bristol and Exeter Railway 4-2-4T locomotives
* LMS/BR Class 4 2-6-4T locomotives
* BR Standard Class 4 2-6-4T
* LMS 2-Cylindered Stanier 2-6-4T
* L&YR Hughes 4-6-4T
* LMS Stanier Class 2 0-4-4T
* Highland Railway Drummond 0-6-4T Class
* Highland Railway Drummond 0-4-4T Class
* 0-8-4T
* 2-6-4T; see 2-6-4
* 0-4-4T; see 0-4-4
* 4-6-4T; see 4-6-4
* 0-6-4T; see 0-6-4
* 2-8-4T; see 2-8-4
* 2-2-4T; see 2-2-4
* 2-4-4T; see 2-4-4

## Other

* 4T-GTE, a model of Toyota T engine
* 4T, a model of LWD Szpak, a Polish utility aircraft
* Piaggio Zip 4T, an urban scooter
* 4T – Vietnam Youth Education Support Center
* 4T, the production code for the 1977 Doctor Who serial The Invisible Enemy
* Fourth Transformation, 2018 campaign promise by Mexico's president to do away with abuses that plagued that nation.
