Our Hearts Were Young and Gay is a book by actress Cornelia Otis Skinner and journalist Emily Kimbrough, published in 1942.

Skinner wrote of Kimbrough, "To know Emily is to enhance one's days with gaiety, charm and occasional terror".

The book was popular with readers, spending five weeks atop the New York Times Non-Fiction Best Seller list in the winter of 1943.

[1] The book was made into a motion picture in 1944, and in 1946 it was dramatized as a 3-act comedy play by Jean Kerr.

[4] During the Second World War, Hugh Trevor-Roper discovered that this book was used as a codebook by German intelligence.