The seismicity in ate 1930s associated with Lake Mead, formed by the Hoover Dam on the Colorado river in the United States of America is known to be the first example of reservoir induced earthquakes. Over the years, several more reservoir sites are known to have induced earthquakes. At present more than 70 such sites have been identified. In this paper a worldwide distribution of reservoir induced earthquakes is presented. Special emphasis is paid to the induced earthquakes at Koyna in Maharashtra, India where, so far, the largest known induced earthquake occurred on December 10, 1967. Unlike other reservoir sites, the seismic activity at Koyna has continued. In the end, the mechanism of reservoir induced earthquakes is briefly reviewed.