The New Zealand fifty-cent coin is a coin of the New Zealand dollar. It was the largest by denomination, diameter and mass to have been introduced on the decimalisation of the currency on 10 July 1967, replacing the pre-decimal crown coin (five shillings).

On 31 July 2006, as part of a revision of New Zealand's coinage, the fifty cent was made smaller, lighter and of a cheaper alloy (nickel-plated steel). On 1 November of that year the previous larger fifty cent coin was demonetised.

Both the larger and smaller coin feature on their reverse the HMS Endeavour on which Captain Cook became the first Briton to reach New Zealand, in October 1769. The obverse, as per all New Zealand coins, features the reigning monarch.

Composition: 75% copper, 25% nickel.

The edge has "five equally spaced 6.35mm plain segments separated by milling".

Portrait of the monarch, legend.

The reverse features the barque Endeavour sailing south. HMS Endeavour was the ship on which Captain Cook became the first Briton to reach New Zealand in October 1769. Mount Taranaki (Egmont) is seen in the distance; above, the denomination 50 (cents); below, ENDEAVOUR; the atrist's initails JB (for [Reginald George] James Berry), in tiny letters on coastline to right of ship.