Sir Robert Milton Worcester, KBE, DL (born 21 December 1933) is an American-born British pollster who is the founder of MORI (Market & Opinion Research International Ltd.) and a member and contributor to many voluntary organisations.

In the 1970s MORI was appointed as the Labour Party’s opinion pollsters and Worcester therefore acted as advisor to the then Prime Minister, James Callaghan.

Worcester was principal investigator for the World Values Survey in Trinidad and Tobago (2006, 2010) and United Kingdom (1998).

He is also a former member of the Fulbright Commission and a former governor of the English-Speaking Union and co-chaired with Lord Watson the Jamestown 400th Commemoration British Committee (2005–07).

He is a vice-president of the Royal Society of Wildlife Trusts, of the United Nations Association and of the European Atlantic Group and was president of ENCAMS (Keep Britain Tidy).

He was appointed Knight Commander of the Most Excellent Order of the British Empire (KBE) in 2005 in recognition of the "outstanding services rendered to political, social and economic research and for contribution to government policy and programmes".