Triacetonamine is an organic compound with the formula OC(CH2CMe2)2NH (where Me = CH3).

It is a colorless or white solid that melts near room temperature.

The compound is an intermediate in the preparation of 2,2,6,6-tetramethylpiperidine, a sterically hindered base and precursor to the reagent called TEMPO.

It is primarily used as a stabilizer for plastics, typically via its conversion to number of hindered amine light stabilizers, but also finds use as a chemical feedstock.

It is used to prepare the hindered amine 2,2,6,6-tetramethylpiperidine, CH2[CH2C(CH3)2]2NH,[2] as well as the radical oxidizer 4-Hydroxy-TEMPO.