The goal of the study is to examine the dry sliding wear behaviour of pure Mg and Mg/nano-BN composite at elevated temperatures. The wear behaviour of the samples was evaluated under loads of 5, 10 and 20 N, at sliding speed of 80, 130 and 180 mm/s and at temperatures of 25, 100 and 175°C. The examination of worn surface, counter-face and wear debris was performed. The results showed that nano-BN particles leads to substantial enhancement of wear resistance for both room and elevated temperatures. Mg/0.25 BN has the lower COF values due to the presence of BN which act as solid lubricant. The wear mechanisms are thermal softening, melting, oxidation, abrasion and delamination.