Using first-principles calculation based on density functional theory, the electronic and magnetic properties of zinc-blende (CaX) 1 /(YX) 1 (Y=Al, Ga, and In; X=N, P, and As) superlattices in the (001) direction are investigated. Results show that all these nine superlattices are half-metals with a total magnetic moment of 1μB. The ferromagnetism comes essentially from the p orbitals of the N, P, and As anions. Moreover, the large half-metallic gaps, the robust stability of the half-metallicity with respect to the lattice contraction, and the small mismatch of lattice constants between the predicted half-metallic superlattices and some corresponding zinc-blende semiconductors make them promising candidates for successful spintronics applications.