Serratia is a genus of Gram-negative bacteria belonging to the family Enterobacteriaceae. These bacteria are known for their ability to produce a characteristic red pigment called prodigiosin, especially under certain environmental conditions. Serratia species are found in various environments, including water, soil, plants, and the gastrointestinal tracts of animals.

One of the most well-known species in this genus is Serratia marcescens.