- THFA
- THG
- THGA
- T. H. Gronwall
- T. H. Gronwall (1877—1932)
- THI
- thiabendazole
- thiacloprid
- thiacrown ether
- thiacyclobutane
- thiacyclobutane; thietane
- thiacyclobutanone
- thiacyclobutene
- thiacyclobutene; thiete
- thiacycloheptatriene
- thiacycloheptatriene; thiepine
- thiacyclopropane
- thiacyclopropane; thiirane
- thiacyclopropene
- thiacyclopropene; thiirene
- thiadiazole
- thiamethoxam
- thiamine
- thiamine chloride
- thiamine pyrophosphate