Sir William Watt Leggatt, DSO, MC, ED (23 December 1894 – 27 November 1968) was an Australian soldier, lawyer and politician.

He served as commanding officer of the 2/40th Battalion and later Sparrow Force during the Second World War, fighting in Timor against the Japanese invasion in 1942.

He was captured by the Japanese and sent to Changi Prison in Singapore.

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