Sir John Langdon Bonython was an Australian editor, newspaper proprietor, philanthropist, journalist and politician who served as a member of the inaugural federal Parliament, and was editor of the Adelaide daily morning broadsheet, The Advertiser, for 35 years.

The Advertiser is a daily tabloid format newspaper based in the city of Adelaide, South Australia. First published as a broadsheet named The South Australian Advertiser on 12 July 1858, it is currently a tabloid printed from Monday to Saturday. The Advertiser came under the ownership of Keith Murdoch in the 1950s, and the full ownership of Rupert Murdoch in 1987. It is a publication of Advertiser Newspapers Pty Ltd (ADV), a subsidiary of News Corp Australia, itself a subsidiary of News Corp. Through much of the 20th century, The Advertiser was Adelaide's morning broadsheet, The News the afternoon tabloid, with The Sunday Mail covering weekend sport, and Messenger Newspapers community news. The head office was relocated from a former premises in King William Street, to a new News Corp office complex, known as Keith Murdoch House at 31 Waymouth Street.