Thiago Keplmair is a Brazilian voice actor, dubbing director, and actor, recognized for his extensive work in the Brazilian Portuguese dubs of numerous anime series and films. He was born in São Paulo on May 13, 1990, and began his voice acting career at the young age of five in 1995. He is the younger brother of fellow voice actress Tatiane Keplmair.

Keplmair's career is marked by a long list of prominent anime roles. He is widely known for voicing Rock Lee across the Naruto franchise, including in Naruto, Naruto Shippūden, and several related films. Another significant early role was as Max in the Pokémon anime, a part he played from his teenage years into adulthood. He also voiced Sota Higurashi in the various InuYasha series and films, a role for which he won the Prêmio Yamato for Best Newcomer in 2003. His other notable anime work includes Tommy in Digimon Frontier, Mizuiro Kojima in Bleach, Tory in MegaMan NT Warrior, and Mascarado in Bakugan Battle Brawlers. In more recent years, he has voiced Franky Franklin in the hit series Spy×Family and its film, as well as Sota Higurashi in the sequel series Yashahime: Princess Half-Demon. A complete list of his credits includes roles in a vast array of other series, such as Hunter × Hunter, Inazuma Eleven, One Piece, and Saint Seiya Omega.

In addition to his voice acting, Keplmair has also worked as an ADR director on Portuguese dubs, with credits including the 2021 film Eien no 831 and the 2011 version of Hunter × Hunter.