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In our paper we study effect of Mn for Fe substitution on magnetic properties of NdFex−1MnxO3 compounds for x = 0 and 0.1, which have been grown by the OFZ technique. The Néel temperature decreases from TN1 = 691 K to TN1 = 621 K, and the anomaly in AC susceptibility, related to spin reorientation, vanishes with Mn substitution. Low temperature heat capacity measurement for sample with x = 0.1 revealed that substitution of Mn for Fe shifts a Schottky-type anomaly at Tsh to higher temperatures. Another anomaly is generated by doping at Tmax = 11 K. The anomaly is smeared out by magnetic field, confirming its magnetic origin. DOI: 10.12693/APhysPolA.126.306 PACS: 75.50.y, 75.47.Lx, 75.30.m, 75.30Kz, 75.30.Et, 75.30.Cr Magnetic properties of NdFeO3 are mostly determined by three magnetic interactions (Fe-Fe, Fe-Nd and Nd-Nd), which are present in this material. Magnetic or-dering of Fe 3+ ions creates a canted antiferromagnetic ordering below the Néel temperature at about TN1