Measurements of the magnetic susceptibility of polycrystalline and single-crystal samples of anhydrous MnCl2 have been carried out from 1.1° to 4.2°K with an ac mutual-inductance bridge. The susceptibility was found to be essentially independent of an applied magnetic field up to 2400 oersteds throughout this region, and displayed anomalous behavior near 2°K indicating a magnetic ordering transition. In view of the observed susceptibility behavior this transition is interpreted as one of an antiferromagnetic nature, although the susceptibilities of both the single-crystal and polycrystalline samples were found to rise slowly with decreasing temperature below the transition region. This interpretation is supported by preliminary neutron diffraction studies below 2°K. A calculation of the magnetic anisotropy is in reasonable agreement with that observed at 4.2°K.