Mn-doped CuAlO 2 bulk samples have been synthesized by solid state reaction. The solid solubility x of Mn in CuAl 1−x Mn x O 2 is about x=0.05. The temperature dependences of the susceptibility of all samples exhibit a paramagnetic behavior and the χ–T curves were fitted by the Curie–Weiss law χ=C/(T−Θ) above 2K. The Curie constant C decreases linearly with increasing Mn content x. The Arrott-plots (H/M–M 2 ) indicate no long-range magnetic order. H/M–M 2 plots were fitted by using third order polynomials, yielding a decrease of the zero-field susceptibility χ(0) with increasing x. There is no evidence for a ferromagnetic transition above 2K in the Mn-doped CuAlO 2 system.