George FitzRoy, 1st Duke of Northumberland, English general and politician, Lord Lieutenant of Berkshire (born 1665)

Lieutenant-General George FitzRoy, Duke of Northumberland, KG, PC was the third and youngest illegitimate son of King Charles II of England by Barbara Villiers, Countess of Castlemaine ; he was the fifth of Charles's eight illegitimate sons. On 1 October 1674, he was created Earl of Northumberland, Baron of Pontefract (Yorkshire) and Viscount Falmouth (Cornwall). On 6 April 1683, he was created Duke of Northumberland. He was described as "a most worthy man", and as "...a tall, Black-Man, like his father, the King." The same John Macky files described his half-sibling, Charles Lennox, Duke of Richmond as Black complexion, also like his father, King Charles II.

This is a list of people who have served as Lord Lieutenant of Berkshire. Since 1689, all Lords Lieutenant have also been Custos Rotulorum of Berkshire.