Aya Kitō (19 July 1962 - 23 May 1988) was a Japanese girl who wrote a diary about her experience with spinocerebellar degeneration disease. Her diary, titled '1 Litre of Tears' was published shortly before her death and later adopted into a Japanese television drama called Ichi Rittoru no Namida (1 Liter of Tears) and then the film A Litre of Tears.