Lexi Nieto is an American voice actress known for her work in English-dubbed anime. She began her career in 2021 and has since collaborated with major studios such as Crunchyroll and FUNimation, often working out of the Dallas-Fort Worth area. Her birthplace is Fort Worth, Texas.

Nieto has portrayed a range of characters across various series. One of her earliest notable roles was as Walkure, the proud and dutiful Musicart, in the 2021 fantasy series takt op. Destiny. She gained significant recognition for voicing the titular role of Tomo Aizawa in the 2023 romantic comedy Tomo-chan Is a Girl!. Her performance as the earnest tomboy Tomo earned her a nomination for Best Voice Artist Performance - English at the 2024 Crunchyroll Anime Awards.

Her other prominent roles include Izliz Swordflail in Dead Mount Death Play and Violet St. George in the second and third seasons of The Ancient Magus' Bride. Her extensive voiceography also features characters such as Pete Reston in Reign of the Seven Spellblades, Juri in Vampire Dormitory, Short in Reborn as a Vending Machine, I Now Wander the Dungeon, Ada in Adventurers Who Don't Believe in Humanity Will Save the World, Ami Kagaya in Liar Liar, Ansley in Why Raeliana Ended Up at the Duke's Mansion, and Beck in By the Grace of the Gods (season 2). She has also provided voices for major franchises, including roles in My Hero Academia, One Piece, and Spy×Family.

Beyond voice acting, Nieto is a singer and performer who created and hosts "Shonen Showtunes," a live event and online media project that blends anime and video game voice acting with theatrical performance. She is also active in anime convention programming and works as a host.