Methanobrevibacter wolinii is a species of methanogen archaeon, named after Meyer J. Wolin.
Coccobacillus with slightly tapered ends, about t 0.6 micrometres in width and 1.0-1.4 micrometres in length, occurring in pairs or short chains. Gram-positive reaction. Its cell walls are composed of pseudomurein. It is a strict anaerobe and its type strain is SH<sup>T</sup> (=DSM 11976<sup>T</sup> =OCM 814<sup>T</sup>). It was first isolated from sheep faeces.