泛醇—细胞色素c还原酶（英语：Ubiquinol—cytochrome-c reductase，EC1.10.2.2）在酶学中是指一种催化如下化学反应的酶：

因此，此酶的两个底物分别是二氢醌（QH₂）与高铁（Fe）细胞色素c，而其三个产物则分别是醌（Q）、亚铁（Fe）细胞色素c以及氢离子。

The coenzyme Q : cytochrome c — oxidoreductase, sometimes called the cytochrome bc₁ complex, and at other times complex III, is the third complex in the electron transport chain (EC1.10.2.2), playing a critical role in biochemical generation of ATP (oxidative phosphorylation). Complex III is a multisubunit transmembrane protein encoded by both the mitochondrial (cytochrome b) and the nuclear genomes (all other subunits). Complex III is present in the mitochondria of all animals and all aerobic eukaryotes and the inner membranes of most eubacteria. Mutations in Complex III cause exercise intolerance as well as multisystem disorders. The bc1 complex contains 11 subunits, 3 respiratory subunits (cytochrome B, cytochrome C1, Rieske protein), 2 core proteins and 6 low-molecular weight proteins.