William FitzAlan, 16th Earl of Arundel

William FitzAlan, 16th Earl of Arundel, 6th Baron Maltravers (23 November 1417 – 1487).

He was a son of John FitzAlan, 13th Earl of Arundel and Eleanor Berkeley. His mother was a daughter of John Berkeley and Elizabeth Betteshorne, granddaughter of Thomas de Berkeley, 3rd Baron Berkeley and his second wife Catherine Clivedon.

His elder brother John FitzAlan, 14th Earl of Arundel died on June 12, 1435. The title passed to John's nephew Humphrey FitzAlan, 15th Earl of Arundel who was only a six-year-old with no descendants. William thus became the heir presumptive and, when Humphrey died three years later on 24 April 1438, he succeeded to the title.

The new Earl married Joan Neville. Joan was a daughter of Richard Neville, 5th Earl of Salisbury and Alice Montagu, Countess of Salisbury. Alice was a daughter of Thomas Montacute, 4th Earl of Salisbury and Eleanor Holland. Eleanor was a daughter of Thomas Holland, 2nd Earl of Kent and Alice FitzAlan. Alice was a daughter of Richard FitzAlan, 10th Earl of Arundel and Eleanor of Lancaster.

William and Joan had five children:

• Thomas FitzAlan, 17th Earl of Arundel (1450–1524).
• William FitzAlan.
• George FitzAlan.
• John FitzAlan.
• Mary FitzAlan.
• Thomas FitzAlan.

William fought in the Second Battle of St Albans (22 February 1461) as a supporter of the House of York. The Yorkists were commanded by his brother-in-law Richard Neville, 16th Earl of Warwick.

Edward IV of England named him a Knight of the Garter in 1471, probably in honor of his support during the Wars of the Roses. He was Warden of the Cinque Ports in 1471 and from 1483 to 1488.