Aya Tsuji (辻 彩 Tsuji Aya) is a tertiary ally featured in the fourth part of JoJo's Bizarre Adventure, Diamond is Unbreakable, introduced in the "Yukako Yamagishi Dreams of Cinderella" story arc and in a key role at the finale of the "Sheer Heart Attack" arc.

She's an esthetician who runs a beauty salon called Cinderella in Morioh. When Yukako Yamagishi enters her clinic, Aya modifies her face to be more attractive. Aya is a Stand User, and works through her Cinderella.