The 2004 New Zealand Warriors season was the 10th in the club's history. The club competed in Australasia's National Rugby League. The coach of the team was Daniel Anderson while Monty Betham was the club captain. Daniel Anderson resigned in June and was replaced by assistant coach Tony Kemp.

The Warriors made no changes to their jersey design for the 2004 season.

The Warriors used Ericsson Stadium as their home ground in 2004, their only home ground since they entered the competition in 1995.

The Warriors played the St. George Illawarra Dragons in Hamilton.

Thirty five players were used by the Warriors in 2004, including seven players who made their first grade debuts. In addition PJ Marsh was in the squad but did not play a game due to a serious injury.

Players not required by the Warriors were released to play in the 2004 Bartercard Cup. These included Iafeta Paleaaesina, who played for the Hibiscus Coast Raiders, Brent Webb, who played for the North Harbour Tigers, Evarn Tuimavave, who played with the Marist-Richmond Brothers, Lance Hohaia, who played with the Waicoa Bay Stallions and the Eastern Tornadoes' Justin Murphy.

Wairangi Koopu won the Player of the Year award.

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