Magnetic properties of 5Fe2O3·3M2O3where M represents Gd‐Tb‐Dy‐Ho‐Er‐Tm‐Yb‐Lu‐Y‐Sm‐Eu are reported. The results are interpreted using Ne´el's molecular field model. A study of the Al substituted gadolinium garnets shows a preference for Al ions to occupydsites.