Resumo. Seven species and four undetermined feather mites are reported from various birds in Piracicaba, Brazil: Dermoglyphus elongatus Mégnin, 1877 (Dermoglyphidae) ex Gallus gallus domesticus (Linnaeus, 1758) “chicken” (Phasianidae), Mesosathes tetrasetosus (Novaes, 1953) (Crypturoptidae) and Neumannella astacus Dabert & Skoracki, 2004 (Dermoglyphidae) ex Crypturellus tataupa (Temminck, 1815) “tataupa tinamou” (Tinamidae), Piciformobia ani (Černý, 1915) (Gabuciniidae) ex Crotophaga ani Linnaeus, 1758 “smooth-billed ani” (Cuculidae), Piciformobia guirae Alzuet, Cicchino & Abrahamovich, 1988 (Gabuciniidae) ex Guira guira (Gmelin, 1788) “guira cuckoo” (Cuculidae), Proctophyllodes thraupis Atyeo & Braasch, 1966 (Proctophyllodidae) ex Thraupis sayaca (Linnaeus, 1766) “sayaca tanager” (Thraupidae), Proctophyllodes troncatus Robin, 1877 ex Passer domesticus (Linnaeus, 1758) “house sparrow” (Passeridae); and undetermined species of the genera: Amerodectes sp. (Proctophyllodidae), Mesalgoides sp. (Psoroptoididae), and Trouessartia sp. (Trouessartiidae) ex Arundinicola leucocephala (Linnaeus, 1764) “white-headed marsh tyrant” (Tyrannidae), and Analges sp. (Analgidae) ex Euphonia chlorotica (Linnaeus, 1766) “purple-throated euphonia” (Fringillidae). Four of them are recorded for the first time in Brazil: D. elongatus, Pi. ani, Pr. thraupis, and Pr. troncatus.