William Alfred Goone-Tilleke (1860–1917) was a Ceylonese-Siamese lawyer, entrepreneur and aristocrat. He was the founder of the law firm Tilleke & Gibbins, a privy councilor and second Attorney General of Siam (1912–1917). In Siam he was also known as Phraya Attakarnprasiddhi (Thai: พระยาอรรถการประสิทธิ RTGS: Phraya Atthakan Prasit).