In this paper, characterization and conductivity of poly(methyl methacrylate)/polyaniline (PMMA/PANi) copolymer is reported. The copolymer was obtained by free-radical polymerization using benzoyl peroxide (BPO) as an initiator. During polymerization, HCl-doped aniline was added into the radical PMMA for a copolymerization to occur. The copolymer ware latter characterized by Fourier Transform Infrared (FTIR) spectroscopy and X-ray Diffraction (XRD) analysis. The FTIR spectrum confirmed the crosslinking between PMMA and PANi. The conductivity analysis acquired using 4-probe method revealed that the copolymer exhibited conductivity of 5 x 10-8 S/cm.