Winston Baldwin Spencer (born 8 October 1948) is an Antiguan politician who was the third prime minister of Antigua and Barbuda from 2004 to 2014.

Spencer led the opposition United Progressive Party (UPP) to victory in the March 2004 parliamentary election.

As Opposition Leader Baldwin Spencer organized public demonstrations and went on a hunger strike to advocate for electoral reform after the widely criticized 1999 elections.

He also led the fight to ensure that opposition had access to state-owned media, such as the television station, Antigua Broadcasting Service (ABS).

Spencer said on this occasion that it would "not be business as usual", and he was promptly sworn in for another term as prime minister when vote counting was completed.

On 19 February 2022, Spencer was involved in a car accident close to the Townhouse Megastore in St. John's, but was reported to be unhurt.