Martha Rendell (10 August 1871 – 6 October 1909) was the last woman to be hanged in Western Australia, for the murder of her de facto husband's son, Arthur Morris, in 1908. She was also suspected of killing his two daughters, Annie and Olive, by swabbing their throats with hydrochloric acid. Although the children died slow and agonising deaths, they had been treated by a number of doctors during their illness, only one of whom expressed any doubts about their deaths.