Streimannia is a genus of lichenized fungi in the family Roccellaceae.

[1] A monotypic genus, it contains the single species Streimannia varieseptata.

[2] The genus was circumscribed by Göran Thor in Opera Bot.

The genus name of Streimannia is in honour of Vale Heinar Streimann (1938–2001), who was an (Estonian)-Australian botanist (Mycology and Bryology).

He worked for the forestry commission in Papua-New guinea and also in the Botanical Garden in Canberra.