Atonio is a given name. Notable people with the name include:
Atonio Lalabalavu (born 1978–79), Fijian politician Atonio Leawere, Fijian politician Atonio Mafi (born 2000), American professional football guard
See also Uini Atonio (born 1990), New Zealand-French rugby player Wards Cove Packing Co. v. Atonio, 1989 lawsuit