Thomas Howard, 21st Earl of Arundel, English courtier and politician, Lord Lieutenant of Northumberland (died 1646)

Thomas Howard, 14th Earl of Arundel KG, was an English magistrate, diplomat and courtier who lived during the reigns of James I and Charles I. He made his name as a Grand Tourist and art collector rather than as a politician. When he died he possessed 700 paintings, along with large collections of sculptures, books, prints, drawings, and antique jewellery. Most of his collection of marble carvings, known as the Arundel marbles, was eventually left to the University of Oxford.

This is a list of people who have served as Lord-Lieutenant of Northumberland. Since 1802, all Lords Lieutenant have also been Custos Rotulorum of Northumberland.