Basilia fletcheri is parasitic bat fly in the genus Basilia, in the subgenus Basilia.^[1][2] It is found in India.

Hugh Scott described this species in 1914. He named it after its collector, Thomas Bainbrigge Fletcher. Two specimens, a male and a female, were discovered on a Dormer's bat in Tamil Nadu, India. Scott placed this species in the genus Penicillidia Kolenati, 1863.^[3] In 1956, Oskar Theodor classified it as belonging to the Basilia Miranda-Ribeiro, 1903 genus, which is in the same subfamily as Penicillidia.^[4]

It was discovered in Chennai.^[3] Scott later reported that Joseph Charles Bequaert sent him a specimen from Bengaluru, which Scott identified as this species,^[5] but Theodor later wrote this specimen was in fact B. punctuata; other places specimens have been collected include Navapur and Mumbai.^[4]

Hosts which specimens have been collected from include: Dormer's bats Scotozous dormeri and Lesser bamboo bats Tylonycteris pachypus.^[4]

It is about 2.5 mm long and has a yellowish color.^[3][4]