Sir Frank Leslie Walcott, KA, OBE (September 16, 1916 – February 24, 1999) was a Barbadian trade unionist, politician, ambassador and one of the ten National Heroes of Barbados. He played a key role in organizing the Barbados labour movement and was a major figure in stimulating participation in the nation's political process.

Walcott was born in Saint Peter, and his policeman father died when Walcott was very young. He was raised in Bridgetown, where he attended Wesley Hall Boys' School, excelling in mathematics and debate from an early age. Becoming an active unionist in his mid-twenties, Walcott served the Barbados Workers' Union for over fifty years. He also served three separate terms as president of the Caribbean Congress of Labour, as well as serving in the Governing Body of the International Labour Organisation and as Vice-President of the Executive Board of the International Confederation of Free Trade Unions. In addition to these posts, Walcott also served with the American Institute for Free Labour Development and was Chairman of the World Employment Conference.