- Tamao oxidation
- Tafel rearrangement
- Takai olefination
- Tebbe olefination
- ter Meer reaction
- Thermite reactions
- Thiele reaction
- Thorpe reaction
- Tiemann rearrangement
- Tiffeneau ring enlargement reaction
- Tiffeneau-Demjanow rearrangement
- Tischtschenko reaction
- Tishchenko reaction, Tischischenko-Claisen reaction
- Tollens reagent
- Trapp mixture
- Traube purine synthesis
- Truce-Smiles rearrangement
- Tscherniac-Einhorn reaction
- Tschitschibabin reaction
- Tschugajeff reaction
- Twitchell process
- Tyrer sulfonation process