产气荚膜梭菌（Clostridium perfringens）是革兰氏阳性杆状厌氧菌，因能分解肌肉和结缔组织中的糖类而产出大量气体以及可以在体内能形成荚膜而得名。发现于人类和其他脊椎动物的肠道、昆虫和土壤等处。

Clostridium perfringens (formerly known as C. welchii, or Bacillus welchii) is a Gram-positive, rod-shaped, anaerobic, spore-forming pathogenic bacterium of the genus Clostridium. C. perfringens is everpresent in nature and can be found as a normal component of decaying vegetation, marine sediment, the intestinal tract of humans and other vertebrates, insects, and soil. It has the shortest reported generation time of any organism at 6.3 minutes in thioglycollate medium.