1-Hydroxy-2,2,6,6-tetramethylpiperidine is the organic compound with the formula C<sub>5</sub>H<sub>6</sub>Me<sub>4</sub>NOH (Me = CH<sub>3</sub>). A white solid, it is classified as a hydroxylamine. The compound has attracted interest as the reduced derivative of the popular radical 2,2,6,6-tetramethylpiperidin-1-yl)oxyl ("TEMPO"). It is a mild base.