The magnetic properties of RCo 3− x Fe x Ga 2 compounds with x = 0 and 1 have been studied from 4.2 to 300 K under magnetic fields in the region 0.1-3 T. The compounds with the light rare earth are ferromagnetic, while those with the heavy rare earth are ferrimagnetic. The iron partial substitution for cobalt increases ordering and decreases the overall magnetocrystalline anisotropy of the compounds.