| Honorific Prefix: | The Reverend |
| Lord Augustus FitzClarence | |
| Birth Date: | 1 March 1805 |
| Burial Place: | St Margaret's Church, Mapledurham, Oxfordshire |
| Noble Family: | FitzClarence |
| Issue: | Dorothea FitzClarence Eva FitzClarence Beatrice FitzClarence Augustus FitzClarence Henry Edward FitzClarence Mary FitzClarence |
| Father: | William IV |
| Mother: | Dorothea Jordan |
| Occupation: | Chaplain |
Lord Augustus FitzClarence (1 March 1805 – 14 June 1854), was the youngest illegitimate son of William IV of the United Kingdom and his long-time mistress Dorothea Jordan. Like his siblings, he had little contact with his mother after his parents separated in 1811.
In 1829 Augustus was appointed a Chaplain of his father (then Duke of Clarence and St Andrews)[1] and later that year he was presented with the vicarage of Mapledurham in Oxfordshire, succeeding John Sumner (later Bishop of Chester and Archbishop of Canterbury).[2] King William IV was a lavish benefactor of the church and the parish and, among his gifts was the clock in the tower which bears his initials, ″W R.″; he also made generous contributions to extend the vicarage and to enclose its adjacent grounds with substantial provisions for the foundation of a new school in the village. The marvellous collection of silver gilt communion plate presented to the church by Lord Augustus shortly after his appointment was probably in turn a gift from his father.[3]
In 1830 he was appointed Chaplain in ordinary to his father (now King William IV), and on 24 May 1831 was granted the rank of a marquess' younger son, being appointed Chaplain to Queen Adelaide after his father's accession to the throne in 1832. Following his studies at Trinity College, Cambridge, he received the degrees of LL.B. (2 June 1832) and LL.D. (6 July 1835).
On 2 January 1845 he married Sarah Elizabeth Catharine Gordon, a daughter of Maj. Lord Henry Gordon (a younger brother of Charles Gordon, 10th Marquess of Huntly and a relative of the husband of his sister Lady Augusta Gordon) by his wife Louisa Payne. By his wife he had six children:[4]
FitzClarence died on 14 June 1854. He was buried at St Margaret's Church, Mapledurham.[7] His widow lived until 23 March 1901.