Sydney Sim BEM (24 May 1920 – 17 August 1990) was an Australian recipient of the British Empire Medal, the decoration awarded to members of the British and Commonwealth armed forces for meritorious civil or military service worthy of recognition by the Crown.
Nicknamed "Signalman Sim", Sydney Sim was awarded the British Empire Medal for his role in facilitating and building - at considerable personal risk - hidden radios at the Changi Prisoner of War Camp in Singapore, during the 2nd World War.