Diplotomma is a genus of lichenized fungi in the family Caliciaceae.

The genus has a widespread distribution and contains about 29 species.

[2] The genus was circumscribed by Julius von Flotow in 1849.

[3] It was later wrapped into Buellia before being segregated from that genus by David Hawksworth in 1980.

This Caliciales-related article is a stub.