Pitt Island or Rangiauria is the second largest island in the Chatham Islands, territorially part of New Zealand, the mainland of which lies 800 kilometres to the west.
Pitt Island lies to the south of its larger neighbour, Chatham Island. It covers an area of 62 km2, and has a population of less than 100 people. A hilly island, it rises to about 300 metres above sea level.
The island was first sighted by the crew of William R. Broughton's ship HMS Chatham in 1790. It was named for William Pitt, 1st Earl of Chatham.