In music, a diminished triad (), also known as the minor flatted fifth (m♭5), is a triad consisting of two minor thirds above the root — if built on C, a diminished triad would have a C, an E♭ and a G♭. It resembles a minor triad with a lowered (flattened) fifth. It can be represented by the integer notation {0, 3, 6}. In the common practice period, the diminished triad is considered dissonant, or unstable, because the dissonant diminished fifth symmetrically divides the octave. The lack of tonal center or stability, possession of a leading-tone, and the dominant function give the chord drive.

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