Sir William Morice (6 November 1602 – 12 December 1676) of Werrington in Devon, was an English statesman and theologian.

He served as Secretary of State for the Northern Department and a Lord of the Treasury from June 1660 to September 1668.

He was elected Member of Parliament for Devon to fill a vacancy in 1648, but was excluded in Pride's Purge in December of that year, probably before he had taken his seat.

He was also made a Privy Counsellor and appointed Secretary of State for the Northern Department, an office he held until he resigned in 1668; he was apparently an undistinguished minister, but justified his tenure of office by his usefulness in the House of Commons.

In the Convention Parliament of 1660 he was re-elected for Newport but was also elected for Plymouth, which he chose to represent, and was that city's MP until his death 16 years later.