Acanthosyris is a genus of plants in the family Santalaceae. It contains the following species:
Acanthosyris annonagustata C.Ulloa & P.M.Jørg.
Acanthosyris asipapote M.Nee
Acanthosyris falcata Griseb.
Acanthosyris glabrata (Stapf) Stauffer ex Govaerts
Acanthosyris paulo-alvinii G.M.Barroso
Acanthosyris spinescens (Mart. & Eichler) Griseb.