Isabella Plains is a suburb in the Canberra, Australia district of Tuggeranong. The postcode is 2905. The suburb is indirectly named after Isabella Maria Brisbane (1821–1849), who was the daughter of Sir Thomas Brisbane, the colonial Governor of New South Wales when the area was first explored by white settlers in 1823. Joseph Wild was employed by Brigade Major John Ovens and Captain Mark Currie to guide them to the Murrumbidgee River. They travelled south along the river and named the area now known as Tuggeranong "Isabella's Plain". This name was adopted, with a slight change of spelling, for the name of the new suburb.