HMS Endeavour, also known as HM Bark Endeavour, was a British Royal Navy research vessel commanded by Lieutenant James Cook on his first voyage of discovery, to Australia and New Zealand from 1769 to 1771.

Launched in 1764 as the collier Earl of Pembroke, she was purchased by the Navy in 1768 for a scientific mission to the Pacific Ocean, and to explore the seas for the surmised Terra Australis Incognita or “unknown southern land”. Renamed and commissioned as His Majesty’s Bark the Endeavour, she departed Plymouth in August 1768, rounded Cape Horn, and reached Tahiti in time to observe the 1769 transit of Venus across the Sun. She then set sail into the largely uncharted ocean to the south, stopping at the Pacific islands of Huahine, Borabora, and Raiatea to allow Cook to claim them for Great Britain. In September 1769, she anchored off New Zealand, the first European vessel to reach the islands since Abel Tasman’s Heemskerck 127 years earlier. In April 1770, Endeavour became the first seagoing vessel to reach the east coast of Australia, when Cook went ashore at what is now known as Botany Bay.