New Leinster was a name given to the Stewart Island in the Royal Charter of November 1840, which stated the division of New Zealand into three parts.

In the 1846 New Zealand Constitution Act, the area known as New Leinster was incorporated into then established New Munster Province.

Following the Treaty of Waitangi, signed on 6 February 1840, New Zealand became a colony of the British Empire, initially administrated as part of the Colony of New South Wales.

In the Royal Charter of November 1840, New Zealand was divided into three divisions: New Ulster, New Munster, and New Leinster.

[1] The New Zealand Constitution Act of 1846 divided New Zealand into two provinces, New Ulster, and New Munster, and the area known as New Leinster was then incorporated into the province of New Munster.