Katherine Mary Isabel "Kath" Williams, née Chambers and formerly Clarey (23 April 1895 – 17 April 1975) was an Australian trade unionist and campaigner for equal pay.She was born at Lara to law clerk Edward Crombie Chambers and Jane Miriam, née Harding. She was educated at Melbourne University High School before graduating as a teacher from the Melbourne College of Domestic Economy in 1915.