"I Could Have Danced All Night" is a song from the musical My Fair Lady, with music written by Frederick Loewe and lyrics by Alan Jay Lerner, published in 1956. The song is sung by the musical's heroine, Eliza Doolittle, expressing her exhilaration and excitement after an impromptu dance with her tutor, Henry Higgins - in the small hours of the morning. In a counterpoint during the second of 3 rounds, two maids and the housekeeper, Mrs. Pearce, urge Eliza to go to bed, but she ignores them.

My Fair Lady is a musical with a book and lyrics by Alan Jay Lerner and music by Frederick Loewe. The story, based on the 1938 film adaptation of George Bernard Shaw's 1913 play Pygmalion, concerns Eliza Doolittle, a Cockney flower girl who takes speech lessons from professor Henry Higgins, a phonetician, so that she may pass as a lady. Despite his cynical nature and difficulty understanding women, Higgins grows attached to her.