Lord Thomas "the Magnificent" Berkeley
- Born: 5 Jan 1352, Berkeley, Gloucestershire, England
- Marriage: Margaret Lisle in 1350
- Died: 13 Jul 1417 at age 65
Thomas, Lord Berkeley enjoyed a long and largely successful career in local and national politics. He suffered temporary eclipse in Gloucestershire in the last years of Richard II's reign, but recovered his position under Henry IV.
In Thomas's lifetime the estates of the Berkeley family reached their greatest extent. His wife, an heiress, whom he had married in 1367, brought him the wide Lisle estates in Oxfordshire, Berkshire and Buckinghamshire.
On Thomas's death in 1417 without male issue, however, the Berkeley inheritance was divided between the heir male and the heir general, and the great lawsuit began which was to last for nearly two centuries.
Thomas married Margaret Lisle in 1350. (Margaret Lisle was born in 1359 in Kingston Lisle, Berkshire, England and died on 20 Mar 1391.)