William Ah Ket (麥錫祥, 20 June 1876 – 6 August 1936) was a noted Australian barrister.

With paternal ancestry from Taishan, southern China, Ah Ket was Australia's first barrister of Asian heritage or ethnicity.

He was born on 20 June 1876 at Wangaratta, Victoria, the only son and fifth child of Mah Ket and Hing Ung.

On 16 November 1912, he married Gertrude Victoria Bullock at the Kew Methodist Church.

He died on 6 August 1936 of arteriosclerosis and renal failure at Malvern, Victoria.