Hector Macdonald Laws (Hec) Waller, DSO and Bar (4 April 1900 – 1 March 1942) was a senior officer in the Royal Australian Navy (RAN). In a career spanning almost thirty years, he served in both world wars. At the helm of HMAS Stuart in the Mediterranean from 1939 to 1941, he won recognition as a skilful ship's captain and flotilla commander. He then transferred to the South West Pacific as captain of the light cruiser HMAS Perth, and went down with his ship against heavy odds during the Battle of Sunda Strait in early 1942.