This paper deals with the distribution of three species of Urocorycaeus in the Indian Ocean based on 330 samples from the IIOE collections. The species Corycaeus (Urocorycaeus) furcifer is widely distributed with higher densities in the Gulf of Aden, central equatorial zone and in the west Australian Sea south of Java. Corycaeus (Urocorycaeus) longistylis occurs predominently in the Bay of Bengal and the Somali Sea. Corycaeus (Urocorycaeus) lautus is represented in small numbers, mostly along the equatorial region, The former two species are more abundant during the north-east monsoon, while C. (U.) lautus commonly occurs during the south-west monsoon