William Brocas (c. 1794 – 12 November 1868) was an Irish artist known for his portraits and figurative drawings.

[1][2] Brocas was exhibited regularly in Dublin, such as with the Society of Artists in 1809 and 1812, and frequently with the Royal Hibernian Academy (RHA) between 1828 and 1863.

In 1841 the Royal Irish Art Union purchased his oil paintings, View of Bray Head and Roderick O'Conor's Castle, to be awarded as prizes.

His portrait of Charles Maturin was later engraved by H. Meyer and published in the New Monthly Magazine in 1819.

[1] Like his father, Brocas also taught and drew political caricatures for publishers including James Sidebottom of Sackville Street, Dublin.