The Life and Adventures of Sir Launcelot Greaves, a novel by Tobias Smollett, was published in 1760 in the monthly paper The British Magazine. Its first number, published in January, 1760, contained the first installment of Smollett’s fourth novel. The novel, Smollett's shortest, differs stylistically from his previous works.

Sir Launcelot is virtuous and strange, and he is surrounded by a Smollettian menagerie whose various jargons are part of this novel's linguistic virtuosity and satire. He is an eighteenth-century gentleman who rides about the country in armour, attended by his comic squire, Timothy Crabshaw, redressing grievances. These characters are obviously inspired by Don Quixote and Sancho Panza, and Smollett's novel has been compared unfavorably with Cervantes'.