A new sensitive spectrophotometric method for the determination of In (III) with 4, 5-dibromopb.enylfluorone and GTMAB is described. The molar absorptivity of the ternary complex is 1.63x 105 1 mol-1 cm-1 at 590nm. The molar ratio of In/Br-PF/CTMAB is 1:3:6. Beer's law obeyed for indium in the range of 0-10 µg/10 ml. In(III)is extracted with n-butyl actate from the sample solution in 5 N hydrobromic acid. The method permits determination of n(10-1-10-5)% of Indium.