粪壳菌纲（学名：Sordariomycetes）是真菌界子囊菌门盘菌亚门的一个纲，其下包括有15个目、64个科、1119个属及 10564个品种。粪壳菌纲物种一般都会产生子囊。

以下各科由于其归属关系未能确定，现时属于「地位未定」，不归入任何亚纲与目：

Sordariomycetes is a class of fungi in the subdivision Pezizomycotina (Ascomycota), consisting of 28 orders, 90 families, 1344 genera,.

Sordariomycetes generally produce their asci in perithecial fruiting bodies.

Sordariomycetes are also known as Pyrenomycetes, from the Greek πυρἠν - 'the stone of a fruit' - because of the usually somewhat tough texture of their tissue.