William Portman (disambiguation)

William Portman (died 1557) was an English judge and Chief Justice of the King’s Bench.

William Portman may also refer to:

• William Portman (died c.1413), MP for Taunton (UK Parliament constituency)
• Sir William Portman, 5th Baronet (d. 1646)
• Sir William Portman, 6th Baronet (1643 – 1690)