Sir William Ouseley HFRSE FSAScot (1767 – September, 1842), was a British orientalist.

He was tutored at home alongside his brother, Gore and his cousin, Gideon Ouseley.

The eldest was Sir William Gore Ouseley, who became a diplomat in South America and a renowned artist.

In 1800, Charles Lord Cornwallis (1738–1805), who had been Governor-General of India from 1786 to 1793, knighted him in recognition of his promotion of oriental studies.

[5] He also published editions of John Lewis Burckhardt's Travels in Arabia, Arabian Proverbs and Notes on the Bedouins and Wahbys.