It has been reported that antiferromagnetic coupling may exist between light-rare-earth and transition-metal ions in Nd 6 Fe 1 1 Ga 3 -type of compounds. In the present paper, the magnetic properties of Nd 6 - x La x Fe 1 2 Ga 2 compounds withx = 0,1,2,3 have been studied by measuring the free-powder high-field magnetization at 4.2 K and by measuring the temperature dependence of the magnetization in the temperature range 4.2-600 K. The Neel temperatures found above room temperature in the M versus T curves only slightly decrease with increasing La content. The M versus B curves at 4.2 K exhibit several metamagnetic transitions. The transition fields increase first and then decrease slowly with increasing La content. By extrapolating the high-field magnetization to infinite field values, values of the Fe moments have been derived by assuming that the Nd moment has the free-ion value.