Joseph Cookworthy (1828 – 21 February 1909) was an Australian politician who was a member of the Legislative Assembly of Western Australia from 1890 until 1897, representing the seat of Sussex. Cookworthy was born in Plymouth, Devon, England, to Jane (née Urquhart) and Joseph Collier Cookworthy. He trained as a physician, but did not take up the profession, instead joining the British Army. He served with the 14th Dragoons in Persia and India, but after the Indian Mutiny of 1857 joined the Indian Civil Service. Cookworthy came to Western Australian in 1873, settling at Busselton (in the colony's South West region). He was elected to the Sussex Road Board the following year, serving until 1880, and also became a justice of the peace. Cookworthy first attempted to enter politics at the 1884