新西兰交易所50指数（NZX 50 Index，NZ50）是新西兰主要的股票市场指数。它包括新西兰股票市场50只最大自由流通股票。自由流通资本化的计算不包括大于20％的股票区块和被视为具有战略意义的5％至20％的区块。

新西兰交易所50指数于2003年3月作为NZSX 50指数推出，以此取代新西兰证券交易所40指数。它在2005年底更名为现在名称。

截至2019年1月31日，新西兰交易所50指数0由以下公司组成：
Air New Zealand Limited
Australia and New Zealand Banking Group Limited
Argosy Property Limited
Arvida Group Limited
The a2 Milk Company Limited
Contact Energy Limited
Chorus Limited
Ebos Group Limited
Fletcher Building Limited
Fisher & Paykel Healthcare Corporation Limited
Freightways Limited
Fonterra Shareholders' Fund
Goodman Property Trust
Genesis Energy Limited
Heartland Group Holdings Limited
Infratil Limited
Investore Property Limited
Kathmandu Holdings Limited
Kiwi Property Group Limited
Mercury Energy Limited
Meridian Energy Limited
Metlifecare Limited
Mainfreight Limited
The New Zealand Refining Company Limited
NZX Limited
Precinct Properties New Zealand Limited
Property for Industry Limited
Port of Tauranga Limited
Pushpay Holdings Limited
Restaurant Brands New Zealand Limited
Ryman Healthcare Limited
Sanford Limited
Scales Corporation Limited
SKYCITY Entertainment Group Limited
Skellerup Holdings Limited
Sky Network Television Limited
Synlait Milk Limited
Stride Property & Stride Investment Management Limited
Spark New Zealand Limited
Summerset Group Holdings Limited
Tourism Holdings Limited
Trade Me Group Limited
Trustpower Limited
Vector Limited
Vista Group International Limited
Vital Healthcare Property Trust
Westpac Banking Corporation
Z Energy Limited