The Perissommatidae are a family of flies (Diptera) that was proposed in 1962 by Donald Colless based on the species Perissomma fusca from Australia.

The family now includes five extant species within the single genus Perissomma, four from Australia and one from Chile.

The larvae live in decaying leaf litter in wet sclerophyll or cool rain forests.

In the case of Perissomma macalpinei, numbers of adults have been observed congregating in clumps of foliage and rising in short, zigzag flights in the sunlight above the foliage for short periods before descending.

[3][4] Fossils of the family are known from the Middle Jurassic to Early Cretaceous of Eastern and Northern Asia.