Nicole Mattos is a Brazilian voice actress known for her work in dubbing anime and live-action series into Portuguese. Based in the Rio de Janeiro dubbing hub, she has been active in the industry since at least 2017.

Her film dubbing work includes providing the voice for the twelve-year-old Diana Prince in the Portuguese version of the 2017 film Wonder Woman and for Mia Reed in the 2021 film The Life After. She has also contributed additional voices for the film X-Men: Dark Phoenix.

In television, Mattos has voiced characters in several live-action series. Her roles include Pam in the Disney series Coop & Cami, Jackie in Noobees, and Antonella in Go! Live Your Own Way. She is also credited as the voice of Louise in Big Shot and a young Jessie in Dead of Summer.

Mattos has a notable portfolio in anime dubbing. She voiced the character Miranda Wallace in the 2019 series Wise Man's Grandchild. She is also the Portuguese voice for Aya Tademaru in the series Kemono Jihen. Another significant role is Lurie Aventrot, one of the main characters in the 2022 fantasy anime The Strongest Sage With the Weakest Crest. Her other anime credits include voicing Yuka Izumi in KenIchi the Mightiest Disciple and contributing to the Portuguese version of Spy×Family.