D小调是一个于D音开始的音乐的小调，组成的音有D、E、F、G、A、降B、C及D（和声小调）。D小调是一个有一个降号的调。

它的相对大调是F大调，并行大调是D大调。

D minor is a minor scale based on D, consisting of the pitches D, E, F, G, A, B♭, and C. In the harmonic minor, the C is raised to C♯. Its key signature has one flat (see below: Scales and keys).

Its relative major is F major, and its parallel major is D major. D minor is one of the two flat-signature keys whose melodic and harmonic scale variations require the addition of a written sharp; the other is G minor.