There were numerous changes during the term of the third Parliament.
List of by-elections Existing electorates ;Akaroa White resigned in 1863 and was succeeded by
Lancelot Walker. ;Auckland West Firth resigned on 30 April 1862. He was succeeded by
James Williamson. ;Avon Creyke resigned on 21 April 1862. He was succeeded by
William Thomson. ;Bruce Kettle died on 5 June 1862. Gillies resigned and the subsequent
first 1865 by-election was won on 8 April 1865 by
Arthur John Burns. ;City of Dunedin Edward McGlashan resigned in 1861. Successors were
John Richardson (1862) and
James Paterson (1862–63). Dick resigned in 1863. The electorate was abolished in 1863 and replaced with the two Dunedin suburb electorates listed below. ;Ellesmere Rowley resigned in 1862 and was succeeded by
James FitzGerald. ;Franklin Nixon was
killed in action during the
Invasion of Waikato on 27 May 1864. (1862–63), then
Henry Hanson Turton (1863–64), and then
Charles Brown (1864–65). ;Parnell Wood resigned in 1865. He was succeeded by
Robert James Creighton. ;Raglan Charles John Taylor resigned in 1865. He was succeeded by
William Buckland. ;Suburbs of Nelson Wemyss resigned in 1861. He was succeeded by
William Wells. ;Waimea Saunders resigned in 1864. He was succeeded by
John George Miles. ;Wairarapa Carter resigned in 1865. He was succeeded by
Henry Bunny.
New electorates ;Dunedin and Suburbs South Dunedin and Suburbs South was established in 1862 as a two-member electorate. It was represented by two MPs:
William Reynolds (from 4 December 1862) and
James Paterson (from 29 April 1863) until the end of the term. ;Dunedin and Suburbs North Dunedin and Suburbs North was established in 1863 as a two-member electorate. It was represented by
John Richardson (from 20 April 1863) and
Julius Vogel (from 29 September 1863) until the end of the term. ;Goldfields The
Goldfields electorate was established in 1862, during the term of the third Parliament. This was a reaction to the large influx of people to Otago during the
Otago gold rush, and because the franchise had been extended to males aged 21 years and over who had held a miner's right continuously for at least three (or six) months. No electoral rolls were established for these districts, and to vote a miner just presented his miner's licence to the election official. Outside Otago where no special Goldfields electorate existed, miners could register as electors in the ordinary electoral district where they lived.
William Baldwin and
George Brodie were elected in the
1863 Goldfields by-election. Baldwin resigned on 27 April 1865.
Charles Edward Haughton won the resulting
1865 by-election held on 29 May contested by three candidates. ==Notes==