Stable, water-resistant photoprotective water-in-oil cosmetic emulsions, well suited for the photoprotection of human skin and/or hair against the deleterious effects of UV irradiation, comprise an effective stabilizing/emulsifying amount of a pair of active emulsifying agents, said emulsifying agent pair comprising (i) at least one polyalkylpolyethersiloxane emulsifier substituted by polyoxyethylene and polyoxypropylene moieties grafted onto the backbone polymer thereof, and (ii) at least one water-in-oil emulsifying polyoxyalkylenated glycol fatty acid ester polymer.