John Bonython may refer to:

• John Langdon Bonython (1848–1939), Australian editor, philanthropist, politician and journalist, a.k.a. Langdon Bonython
• John Lavington Bonython (1875–1960), Australian publisher and Lord Mayor of Adelaide, son of Langdon Bonython, a.k.a. Lavington Bonython
• John Langdon Bonython (1905–1992), South Australian businessman, grandson of Langdon Bonython, son of Lavington Bonython

• Bonython (disambiguation)