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This paper presents an algorithm for locating faults on series-compensated transmission lines. The algorithm suits to both single- and double-circuit series-compensated lines. Use of two-end synchronized measurements of currents accomplished by current differential protective relays with additional incorporation of the locally measured three-phase voltage is considered. More superior solution with the fault location function embedded into the differential relays at both line ends is considered. The algorithm applies two subroutines designated for locating faults on particular line section, and additionally the procedure for selecting the valid subroutine. The developed algorithm has been tested and evaluated using signals taken from ATP-EMTP versatile simulations of faults. The presented sample results of the testing show the validity of the presented fault location algorithm and its high accuracy.