Barium titanate-0?25 wt-% carbon nanotube nanocomposite was synthesised by the mechanical milling process. The nanocomposite was characterised by X-ray diffraction, SEM, thermal gravimetric analysis and LCR meter. The thermal stability of the composite was lower than that of pure barium titanate, which was attributed to the presence of trace amounts of sodium dodecyl benzene sulphonate. The relative dielectric constant of the composite was significantly greater and was attributed to the Maxwell-Wagner polarisation effect.