We re-examined archived data obtained by the Pioneer Venus Large Probe Neutral Mass Spectrometer. Our results reveal the presence of several minor chemical species in Venus’ clouds including phosphine, hydrogen sulfide, nitrous acid (nitrite), nitric acid (nitrate), hydrogen cyanide, and possibly ammonia. The presence of these chemicals suggest that Venus’ clouds are not at equilibrium; thereby, illuminating the potential for [possibly life-related] chemistries yet to be discovered.