The paper presents the results of an investigation into the synthesis of manganese silicides MnSi and MnSi_1.73, which was performed using the aluminothermic reduction of metal oxides. Thermoelectric and magnetic properties of the obtained compounds have been studied. X-ray phase analysis showed that the alloy synthesized from reaction mixture (MnO₂+Si+Al) is a single-phase compound with monosilicide silicon detected in its composition. However, the alloy synthesized from reaction mixture (MnO2+Si+Al) is not single-phase as it contains phases such as MnSi_1.735, Mn₂Al₅Si₅ and a small amount of unreacted silicon. The alloys' microstructure consists in a homogeneous matrix with uniformly distributed pores. Thermoelectric measurements have revealed that the sample prepared from mixture MnO₂+Si+Al exhibits hole conductivity, Seebeck coefficient of S=30 μV/K at 400 K, and electrical resistance of ρ=290 μΩ· cm cm at 1050 K. It was also shown that the alloys exhibit for MnSi (a) a distinct ferromagnetic behavior with saturation magnetization σ_s corresponding to ~ 0.5 μB (Bohr magneton) per Mn atom. Keywords: Seebeck coefficient, thermoelectric alloy, magnetic properties, aluminothermal synthesis.