A by-election for the seat of Katanning in the Western Australian Legislative Assembly was held on 31 August 1935, following the death of the sitting member, Arnold Piesse of the Country Party.
Arnold Edmund Piesse had been the member for Katanning, located in the Great Southern region of Western Australia, since defeating Alec Thomson at the 1930 state election.
Although a sitting member, Piesse left Australia in February 1935 for an extended trip to England for health reasons.
[1] Following the official notification of a vacancy, the Speaker of the Legislative Assembly, Alexander Panton, authorised the issuing of writs for a by-election, which occurred on 30 July.
[6] The Country Party, endorsed four candidates, although one, John Francis Silverthorne of Muradup, failed to meet the deadline for nominations.