Katherine Masilungan is a Filipino voice actor known for her extensive work in the Tagalog dubbing of anime series. Information about her career is primarily derived from credits for these localized productions. She is also referred to as Katherine Teng Perez Masilungan in some credits.

Masilungan's body of work includes a wide array of roles in popular anime series. She voiced the main characters Sakura Haruno, Hinata Hyuuga, and Anko Mitarashi in the Tagalog version of Naruto and Naruto Shippūden. In One Piece, she provided the voices for several key characters, including Nami, Nico Robin, Makino, and Doctor Kureha. She also took on the role of Fllay Allster in Mobile Suit Gundam Seed and Shippo in the Inuyasha series and its films.

Other notable roles include the characters mentioned in the user query: Mai in Itsudatte My Santa!, Youko Mizuno in Maria Watches Over Us, Katie Minami in Mirmo Zibang!, and Brave in Bikkuriman 2000. Her filmography also features parts in series such as Nagisa Misumi in Pretty Cure, Bloodberry in the Saber Marionette J series, Lina Inverse in redubbed versions of The Slayers, and Mokuba Kaiba in Yu-Gi-Oh!. Additional credits include roles in Eureka Seven, Zenki, and Cyborg Kuro-chan.

Beyond voice acting, Masilungan has also contributed to anime production as a dubbing director. One confirmed credit for this role is for the Tagalog version of Ouran High School Host Club. Her work is part of the Filipino dubbing industry that localizes international animated content for broadcast in the Philippines.