Niki Romijn is a Dutch singer and voice actress known for her extensive work in the Dutch dubbing of animated films and television series. Born in Amersfoort, Netherlands, in 1960, she began her artistic career early, writing her first song at the age of twelve. She later studied at the conservatory in Hilversum and performed in various musical acts, including the band Ovation and the girl band The Garlic Sisters.

Romijn's voice acting career includes major roles in the Dutch versions of popular anime and animated series. Among her most recognized roles are Clover in Totally Spies! and Bloom in Winx Club, for which she also performed the title song. In the realm of anime, she is known for providing the voice of Sophie in the Dutch dub of Hayao Miyazaki's film Howl's Moving Castle, as well as the character Lin in another Studio Ghibli film, Spirited Away. She also performed the role of Mokuba Kaiba in the Dutch versions of both the Yu-Gi-Oh! television series and the film Yu-Gi-Oh!: The Movie.

Beyond these prominent roles, Romijn has contributed to the Dutch adaptations of many other series and films. Her work in the Pokémon franchise includes voicing various characters such as Ritchie, Casey, and Neesha across different series and films. She voiced Ginger in As Told by Ginger, A.J. and Trixie in The Fairly OddParents, and Lisa Simpson in The Simpsons Movie. Her career also extends to voice direction and translation for Dutch dubbing projects, including work on Inspector Gadget and Free Willy.

In addition to her voice work, Romijn has maintained a career as a singer and performer. She has released solo albums, including Soon in 2001 and Roos Van Jou Mond in 2006, the latter based on poems by Ingrid Jonker. Between 2009 and 2011, she toured the Netherlands with a show titled Kate, dedicated to the music of singer Kate Bush.