Nathalie Karsenti is a French voice actor, primarily known for her extensive work dubbing foreign-language films and television series into French. Born in Nantes, France, she began her performing arts training with a cinema workshop at the ACAS school, followed by three years of drama at the regional conservatory in Nantes under Jacques Couturier, and later continued her studies at the Cours Florent in Paris. Her early career included roles in theatre, as well as appearances in short and feature-length films.

Karsenti's transition to voice acting was prompted by Danielle and Déborah Perret, who invited her for a dubbing test. A pivotal moment came when director Vincent Violette cast her as the voice of Anne Hathaway's character in the series La Famille Green, leading her to focus entirely on dubbing. She has since become a prominent figure in the field, providing the French voice for numerous Hollywood actresses across multiple productions. Among her most notable recurring roles are Shawnee Smith as Amanda Young in the Saw film series, Eva Mendes in films like Fast and Furious 5, January Jones in Mad Men and X-Men: First Class, and Zoe Saldaña as Gamora within the Marvel Cinematic Universe.

In addition to her work on live-action films, Karsenti has contributed to animated projects. In the realm of anime, she voiced Mari Mutō, the mother in the original Netflix series Japan Sinks: 2020. Her other animation credits include the role of Deidre Dennis / Dee-Dee in the animated film Batman Beyond: Return of the Joker, Miyuki Haruno in the Bakuman. anime series, and Gamora in the Disney+ animated series What If...?. She also provided original voices for the 2023 animated film Mars Express.

Throughout her career, Karsenti has developed recurring collaborations with several French dialogue directors, whom she credits as influences and mentors. These include Danielle Perret, Philippe Peythieu, Hervé Bellon, and Michèle Dorge. Beyond her performance work, she has contributed to the visibility and appreciation of the dubbing profession. In 2010, she created the interview program Il était une voix, initially for television and later on her own YouTube channel, NKA TV, where she has interviewed many of France's most renowned voice actors. She also teaches and directs young actors in a dubbing program at the Cours Florent in Bordeaux.