Eiko Ishibashi (石橋英子, Ishibashi Eiko) is a Japanese singer-songwriter and musician.

She has frequently worked with Jim O'Rourke, with O'Rourke producing several of her albums and Ishibashi playing on his album Simple Songs. Together with Tatsuhisa Yamamoto they formed the band Kafka's Ibiki.

In 2016, she released the album Kouen Kyoudai, a collaboration with the Japanese noise musician Masami Akita (better known as Merzbow). She composed the music for the 2019 anime Blade of the Immortal. She has collaborated with director Ryusuke Hamaguchi on two projects: the 2021 film Drive My Car, and the 2023 film Evil Does Not Exist.