The electrical resistivity and thermal conductivity of a liquid crystalline polymer (LCP) filled with a commercial carbon black (CB) of various volume fractions (phi) is investigated. The percolation threshold (phi (c)) is found at about 3%, and the resistivity (rho) as a function of (phi - phi (c),) satisfies the exponential function. Although the pure LCP is highly anisotropic in thermal and mechanical properties after processing, the composite samples exhibit no preferential direction for electrical conduction. Samples of phi below phi (c). exhibit a negative temperature coefficient of resistivity while those above phi (c) show almost no temperature dependence from room temperature to 200 degreesC. In addition, the samples at lower phi have higher thermal conductivity in the LCP flow direction than those measured in the transverse and thickness directions, and they approach the same value at higher phi. This result indicates that preferential molecular alignment of the matrix LCP is responsible for the behavior of the thermal conductivity of the composites.