Guildford was an electoral district of the Legislative Assembly in the Australian state of Western Australia from 1901 to 1962.
Known as Guildford-Midland from 1930 onwards, the district was located in the north-eastern suburbs of Perth.
Johnson's tenure as a parliamentarian was a long one: he was the district's member from 1906 to 1917 and again from 1924 until his death in 1948.
Johnson was succeeded at a by-election by Labor candidate John Brady.
When the district was abolished, Brady transferred to the new seat of Swan at the 1962 state election.