British general, most prominent for his role in suppressing the Irish Rebellion of 1798 and for his campaigns in India from 1801 to 1806 against Daulat Rāo Sindhia of Gwalior and Jaswant Rāo Holkar, leaders of the Marāthā confederacy.

Lake served in the Seven Years' War, in the American Revolutionary War, and in the wars of the French Revolution. He took command of the British Army in Ireland in April 1798, and when rebellion broke out, defeated the insurgents at Vinegar Hill on June 21. He also stopped a landing of French troops at Killala Bay in September.

In 1800 Lake was made commander in chief in India, and after arriving in Calcutta in July 1801 strove to modernize the Indian Army. He became a full general the following year and in 1803 won victories over the disunited Marāthās, capturing Delhi and defeating Sindhia's French-trained army at Laswari on November 1; rewarded with a peerage, he went on to rout Holkar at Farrukhābād, in November 1804, but was repulsed at Bharatpur early in 1805 and was forced to make peace in April. He was then removed from his command, but was made a viscount on his return to England.