William Eyre (British Army officer, died 1765)

William Eyre (died 1765) was a British Army officer who served with some distinction during the French and Indian War. Eyre was an engineer by trade who commanded infantry and irregulars successfully in North America. Eyre won a notable victory whilst defending Fort William Henry from a Franco-Indian assault in March 1757, several months before the more well known siege made famous in the novel Last of the Mohicans. Eyre was instrumental in the design and construction of Anglo-American fortifications in the New York-Niagara frontier.

In 1761, having "grown tired of the war in this country" after nearly a decade of service in America and disillusioned with British-Indian policy, Eyre requested leave to return to England. In perhaps a testament to his importance to the army in America, Eyre's leave was not granted until 1764, however he drowned off the coast of Britain whilst returning home in 1765.