In music theory, the subdominant parallel is terminology used in German theory derived mainly from Hugo Riemann, Sp, in major, and sP, in minor, is the (US) relative to the subdominant and is thus considered to have or fulfill the function of the subdominant.

In C major:

• Sp is D-minor, US supertonic

In C minor:

• sP is Ab-major, US submediant