Bartholomew Roberts (17 May 1682 – 10 February 1722), born John Roberts, is a Welsh pirate who raids ships off America and West Africa between 1719 and 1722.

He is the most successful pirate of the Golden Age of Piracy, as measured by vessels captured, taking over 470 prizes in his career.

He is also known as Black Bart (Welsh: Barti Ddu), but this name is never used in his lifetime, and also risks confusion with Black Bart of the American West.

He also has "Sunday services" on his first vessel.