Night and Day is a novel by Virginia Woolf first published on 20 October 1919. Set in Edwardian London, Night and Day contrasts the daily lives and romantic attachments of two acquaintances, Katharine Hilbery and Mary Datchet. The novel examines the relationships between love, marriage, happiness, and success.

Adeline Virginia Woolf (25 January 1882 – 28 March 1941) was an English writer and one of the foremost modernists of the twentieth century. During the interwar period, Woolf was a significant figure in London literary society and a central figure in the influential Bloomsbury Group of intellectuals. Her most famous works include the novels Mrs Dalloway (1925), To the Lighthouse (1927) and Orlando (1928), and the book-length essay A Room of One`s Own (1929), with its famous dictum, "A woman must have money and a room of her own if she is to write fiction."