Ainsworthia is a genus of fungi in the family Chaetothyriaceae.

[1] The genus was circumscribed by Augusto Chaves Batista and Raffaele Ciferri in Sydowia Beih.

vol.3 on page 4 in 1962.

The genus name of Ainsworthia is in honour of Geoffrey Clough Ainsworth (1905–1998), who was a British mycologist and scientific historian.

[2] As accepted by Species Fungorum;[3] Former species;