The structure, transport properties and the magnetoresistance behavior in the temperature interval 77–400K of the perovskite-like lanthanum manganites La 0.6 Pb 0.4− x Mg x + y MnO 3 (x=0, 0.1, 0.2 and y=0, 0.2) were investigated. Polycrystalline bulk samples were prepared by sol–gel self-combustion and subsequent heat treatment at 1000°C for different times, 40, 80, 160 and 320min. All manganites exhibit a peak in the resistivity around 200–250K, below the ferromagnetic ordering temperature (320–330K). An isotropic and negative magnetoresistance has been observed in all compounds. Magnetoresistance MR exhibits a peak in the temperature range 130–150K, below SC–metal transition temperature. Magnitude of MR at the peaks was nearly 27% in the magnetic field of 2T. At room temperature, a magnetoresistance of 9.5% for La 0.6 Pb 0.2 Mg 0.2 MnO 3 composition was obtained. Longer heat treatment time enhanced the magnetorezistive properties.