1 Litre no Namida

1 Litre no Namida (1リットルの涙; lit. "1 Litre of Tears"; also called A Diary with Tears or A Diary of Tears) is a 2005 Japanese television drama series broadcast by Fuji TV. The story based on the story of Aya Kitō, who suffered from a degenerative disease and died at the age of 25. Directed by Riki Okamura, it stars Erika Sawajiri, Ryō Nishikido, Hiroko Yakushimaru and Takanori Jinnai.

The script is based on Aya's diary that she kept writing in until she could no longer hold a pen. The diary was later titled One Litre of Tears and sold over 1.1 million copies in Japan.

A new film is scheduled for 2027, with Nishikido reprising his role.