Ponnambalam Arunachalam was a Ceylonese civil servant and a member of the Executive Council of Ceylon and Legislative Council of Ceylon.

Gate Mudaliyar Arunachalam Ponnambalam, JP, UM was a Ceylonese colonial-era government functionary, businessman and philanthropist. He was the cashier at the Colombo Kachcheri and was appointed to the titular rank of Gate Mudaliyar.