G小调是一个于G音开始的音乐的小调，组成的音有G、A、降B、C、D、降E、F及G（和声小调）。G小调是一个有两个降号的调。

它的相对大调是降B大调，并行大调是G大调。

G minor is a minor scale based on G, consisting of the pitches G, A, B♭, C, D, E♭, and F. For the harmonic minor scale, the F is raised to F♯. Its relative major is B-flat major, and its parallel major is G major.

Changes needed for the melodic and harmonic versions of the scale are written in with accidentals as necessary. G minor is one of two flat key signatures that require a sharp for the leading-tone (the other is D minor).