We construct log N-log S relations for stars based on medium x-ray luminosities for dF, dG, and dK stars previously reported for the Einstein Observatory/Center for Astrophysics stellar survey and on a detailed x-ray luminosity function derived here for dM stars, and investigate the stellar contribution to the diffuse soft x-ray background. The principal results are that stars provide approx.20% of the soft x-ray background in the 0.28--1.0 keV passband and therefore contribute significantly to the soft x-ray background in this energy range (with dM stars constituting the dominant contributing class), and that the stellar contribution to the diffuse x-ray background in the 0.15--0.28 keV passband is < or approx. =3%.