Nanami Aiba is a voice actress from Kanagawa Prefecture, Japan, who is known for her work in adult anime and game productions. She is affiliated with the talent agency Atelier Peach. She often works under pseudonyms, and is also known by the stage names Mizuno Nanami, Hoshino Nanami, and Umehara Ai.

In the world of anime, Aiba is best recognized for her role as Rei Tadasugawa in the 2025 television series Nukitashi the Animation, an adaptation of Qruppo's adult visual novel. Prior to the anime adaptation, the character of Rei Tadasugawa was voiced by Nanami Mizuno in the original visual novel; industry reporting suggests that this is likely the same voice actress performing under a different name, though this has not been officially confirmed.

Her other credited voice roles in animation include Bloody Cherry in the 2025 series Seihou Shouka Saint Lime, Otori Chikage in the 2021 production Real Eroge Situation 2 The Animation, and Miyanoue Kanna in the 2018 series Real Eroge Situation The Animation. As her career primarily involves adult-oriented works, her roles are often performed under pseudonyms specific to that sector of the industry.