The Earldom of Plymouth has been created thrice, twice in the Peerage of England and once in the Peerage of the United Kingdom. The first creation was in 1675 for Charles FitzCharles, illegitimate son of King Charles II. He died without heirs, so the title became extinct. The second creation was in 1682 for Windsor Hickman-Windsor; that title, too, eventually became extinct. The final creation came in 1905 when Robert Windsor-Clive was created Earl.

The Earl also holds the titles of Viscount Windsor, created in 1905, and Baron Windsor, created in 1529 by writ.

Earls of Plymouth, First Creation (1675)

• Charles FitzCharles, 1st Earl of Plymouth (1657-1680)

Earls of Plymouth, Second Creation (1682)

• Windsor Hickman-Windsor, 1st Earl of Plymouth (b. 1627-1687)
• Other Windsor, 2nd Earl of Plymouth (1679-1725)
• Other Windsor, 3rd Earl of Plymouth (1707-1732)
• Other Lewis Windsor, 4th Earl of Plymouth (1731-1771)
• Other Hickman Windsor, 5th Earl of Plymouth (1751-1799)
• Other Archer Windsor, 6th Earl of Plymouth (1789-1833)
• Andrews Windsor, 7th Earl of Plymouth (1754-1837)
• Henry Windsor, 8th Earl of Plymouth (1768-1843)

Earls of Plymouth, Third Creation (1905)

• Robert George Windsor-Clive, 1st Earl of Plymouth (1857-1923)
• Ivor Miles Windsor-Clive, 2nd Earl of Plymouth (1889-1943)
• Other Robert Ivor Windsor-Clive, 3rd Earl of Plymouth (b. 1923)