Night and Day (1919) is a novel by Virginia Woolf. Set in Edwardian London, Night and Day contrasts the daily lives of two friends, Katharine Hilbery and Mary Datchet. The novel examines the relationships between love, marriage, happiness, and success.

There are four major characters, Katharine Hilbery, Mary Datchet, Ralph Denham, and William Rodney.

Night and Day deals with issues concerning women's suffrage, if love and marriage can coexist, and if marriage is necessary for happiness.

Adeline Virginia Woolf (1882-1941) was an English author, essayist, publisher, and writer of short stories, regarded as one of the foremost modernist literary figures of the twentieth century.

During the interwar period, Woolf was a significant figure in London literary society and a member of the Bloomsbury Group.

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."