The present study investigates the structural, MAGNETIC, and electrical properties of non-stoichiometric LaMn1-xCuxO3 (x= 0, 0. 025, 0. 05, 0. 075, and 0. 125) ceramics. The results of X-ray diffraction refinement indicated that all samples were crystallized in an orthorhombic structure and no apparent crystal structure change was introduced by doping Cu up to x=0. 125. The FerroMAGNETIC (FM) nature revealed by non-stoichiometric LaMn1-xCuxO3- was verified through the appearance of ParaMAGNETIC-FerroMAGNETIC (PM-FM) transition temperatures in AC MAGNETIC susceptibility measurement of the samples. Due to the coexistence of AntiferroMAGNETIC (AFM) and FM phases, all samples contained Re-entrant Spin Glass (RSG) and Cluster Spin Glass (CSG) states. The results showed that FM phase was comparable or even dominant in the doped samples up to x=0. 075; however, after doping, AFM phase overcame the FM phase as a result of reduction of double exchange interaction. Temperature dependence of resistivity measurement indicated that upon increasing the Cu-doping level, resistivity decreased, except for the x=0. 125 sample, and that metal-insulator transition at low temperatures was detected in the doped samples. Furthermore, changing the MAGNETIC phase in the case of x=0. 125 sample from FM (in x=0. 075) to AFM dominant phase was accompanied by changing the TRANSPORT parameters obtained from small polaron hopping models.