Nickel base superalloys (Alloy 600, 690 and 693) were assessed by potentiodynamic anodic polarization technique for their pitting corrosion behavior in solution annealed and sensitized condition, in 3 M HNO3 containing various concentrations of chloride ions, at 250C. From the results of investigation, the solution annealed specimens showed superior pitting corrosion resistance with higher pitting potential compared to the sensitized specimens for all the alloys. Optical micrographs of the experimented specimens showed very few pits on the solution annealed specimens, where as severe pitting with grain boundary attack was observed in the sensitized specimens and the population and size of pits were found to increase with chloride ion concentration. Scanning electron microscopy study of the sensitized specimens indicated that the initiation of pits occurred in and around the grain boundary regions. Alloy 690 showed superior pitting corrosion resistance than Alloy 693 followed by Alloy 600.