New Zealand is one of only two countries in the world—the other being Denmark—with two official national anthems of equal status. The traditional anthem "God Save the King" is generally used only on royal and viceregal occasions. "God Defend New Zealand" is more commonly used on occasions when the national identity of New Zealand is the focus, such as sports events, where it is sung with English and Māori verses. On a few occasions both anthems may be used.

"God Save the King" is the national anthem of the United Kingdom and the royal anthem of each of the British Crown Dependencies, one of two national anthems of New Zealand, and the royal anthem of most Commonwealth realms. The author of the tune is unknown and it may originate in plainchant, but an attribution to the composer John Bull has sometimes been made.