Whanganui (known as Wanganui until 1996) is a New Zealand parliamentary electorate. It was first established in 1860 for the 3rd Parliament and has existed continuously since then.
Since the 2005 election, it has been held by Chester Borrows of the National Party.
In the 1860 electoral redistribution, the House of Representatives increased the number of representatives by 12, reflecting the immense population growth since the original electorates were established in 1853. The redistribution created 15 additional electorates with between one and three members, and the Wanganui and Rangitikei electorate was split into two separate electorates: the Rangitikei electorate and the Wanganui electorate.
The electorate is based on the city of Whanganui, the towns Opunake and Hawera, and smaller centres Kaponga, Eltham, Normanby, Manaia, Patea and Waverley.
Henry Shafto Harrison was the first representative. His 7 February 1861 election was declared invalid. He stood again in the 1861 by-election and was elected again. He then served the electorate until the end of the term in 1866.
Harrison, John Bryce and John Garner contested the 1866 election. The nomination meeting was held on Friday, 2 March 1866. Harrison, Bryce and Garner received 51, 102 and 7 votes, respectively, at the election on the following day. Bryce was thus declared elected. Bryce resigned in 1867.