Testament of Youth is a memoir of British nurse and activist Vera Brittain (1893–1970), published in 1933. Brittain's memoir covers the years 1900 to 1925, and continues with Testament of Experience, published in 1957, and encompassing the years 1925 to 1950. Between these two books comes Testament of Friendship, which is essentially a memoir of Brittain's close colleague and friend Winifred Holtby. A final segment of memoir, to be called Testament of Faith or Testament of Time, was planned by Brittain but remained unfinished at her death.

Vera Mary Brittain was an English Voluntary Aid Detachment (VAD) nurse, writer, feminist, socialist and pacifist. Her best-selling 1933 memoir Testament of Youth recounted her experiences during the First World War and the beginning of her journey towards pacifism.