Sir Shridath Surendranath RamphalOM (born 3 October 1928), often known as Sir Sonny Ramphal, is a Guyanese politician who was the second Commonwealth Secretary-General, holding the position from 1975 to 1990. He was also the foreign minister of Guyana from 1972 to 1975, and assistant attorney general of the West Indies Federation from 1958 to 1962.