Utopia (in full: Libellus vere aureus, nec minus salutaris quam festivus, de optimo rei publicae statu deque nova insula Utopia) is a fictional work by Thomas More published in 1516. English translations of the title include A Truly Golden Little Book, No Less Beneficial Than Entertaining, of the Best State of a Republic, and of the New Island Utopia (literal) and A Fruitful and Pleasant Work of the Best State of a Public Weal, and of the New Isle Called Utopia (traditional).

Despite modern connotations of the word "utopia," it is widely accepted that the society More describes in this work was not actually his own "perfect society." Rather he wished to use the contrast between the imaginary land's unusual political ideas and the chaotic politics of his own day as a platform from which to discuss social issues in Europe.