Traditionally popular subjects for nudes are historic themes, scenes from Roman or Greek mythology, Biblical scenes, or allegories. Since the 19th century, nudes will also often show "normal people" in nature or at home.
The Japanese term for almost nude, often used in Japanese art and fetishes that involve almost-full nudity (e.g. wearing only an apron, or only socks), is Hadaka (裸). The Japanese term for completely nude is Zenra (全裸).
Nude seen from behind with legs apart. Study by Luca Signorelli (c. 1441/50-1523).
Three Graces. Study by Raphael Sanzio (1483-1520).
Young man holding a small child. Study by Jacopo Pontormo (1495-1556).
Copy after Bandinelli's Cleopatra, by Agnolo Bronzino (1503-1572).
Seated female nude by Pierre-Paul Prud'hon (1758-1823).
La source by Jean Auguste Dominique Ingres (1856).
Le coucher de Sappho by Charles Gleyre (1867).
Mary Magdalene In The Cave by Jules Joseph Lefebvre (1876).
Fanciulla entra nella vasca by Giovanni Boldini (1842-1931).
Il sonno by Gustave Courbet (1819-1877).
Cupid and Psyche by Jacques-Louis David (1817).
Phryne before the Areopagus by Jean-Léon Gérôme (1861).
The Bath by John Reinhard Weguelin (1849-1927).
The Awakening of Psyche by Guillaume Seignac (1870-1924).
The Swimming hole by Thomas Eakins (1885).
The following links point to galleries on Wikimedia Commons: