William Eyre (died 1764) was an officer in the British Army during the French and Indian Wars.

Eyre served in the Royal Engineers during the Jacobite rising of 1745 and the War of the Austrian Succession.

[4] He was also made quartermaster general and director of artillery for the campaign, making three roles he filled as the only British regular officer in the otherwise American colonial militia and Mohawk Indian army of General Johnson.

During the Battle of Lake George he commanded the artillery that defeated repeated French attacks.

After the battle he planned and led the construction of Fort William Henry, becoming its first commandant.