The following lists events that happened during 1858 in New Zealand.

• Head of State — Queen Victoria
• Governor — Colonel Thomas Gore Browne

The 2nd Parliament continues.

• Speaker of the House — Sir Charles Clifford
• Premier — Edward Stafford.
• Minister of Finance — William Richmond
• Chief Justice — Hon George Arney who had been appointed on 2 September 1857 arrives early in the year.

• Provincial Council Chambers are constructed in Wellington. These will eventually become the seat of Parliament.^[1]
• 19 August – the Electoral Districts Act 1858 is enacted, increasing the number of members of parliament from 37 to 41, with the supplementary elections held in late 1859.^[2]

• 1 April: Frederic Truby King, health reformer, founder of Plunket Society.
• 10 June: William Millton, rugby union player
• 16 July (in England): John Luke, Mayor of Wellington and politician.
• 17 October: John Jenkinson, politician.
• 1 November (in Australia): John Rigg, politician.

• 8 January: Daniel Wakefield, coloniser and judge.

• List of years in New Zealand
• Timeline of New Zealand history
• History of New Zealand
• Military history of New Zealand
• Timeline of the New Zealand environment
• Timeline of New Zealand's links with Antarctica

Media related to 1858 in New Zealand at Wikimedia Commons