Nanako Inoue is a Japanese voice actress affiliated with the agency Holy Peak. She was born on December 12, 1983, in Tokyo. Inoue is a graduate of Senshu University's Faculty of Humanities, Department of Japanese Language and Literature, and also holds a high school teaching license which she obtained during her university years.

Inoue made her debut as a voice actress in 2005 while in her fourth year of university, landing the role of Mashiko Mimi in the television anime series Happi Seven. The following year, she began her most prominent and long-running role, providing the voice for the character Kirche Augusta Frederica von Anhalt-Zerbst in the anime adaptation of The Familiar of Zero. She reprised this role for the character across all subsequent sequels, including The Familiar of Zero: Knight of the Twin Moons, The Familiar of Zero: Rondo of Princesses, and The Familiar of Zero F.

In addition to her work on The Familiar of Zero series, Inoue's other notable anime voice roles from this period include Queen Rinse in the 2007 series Shampoo Ōji and Mashiko Mimi in the 2015 OVA for Trinity Seven. Her work on The Familiar of Zero series represents a recurring collaboration with key cast members of that production, such as Rie Kugimiya, Yui Horie, and Satoshi Hino.