Natalia Gastiain Tena (born 1 November 1984) is a British actress and musician. She is best known for playing the role of Nymphadora Tonks in the Harry Potter film series, which also featured David Bradley, Michelle Fairley, Freddie Stroma, and Jim Broadbent. She also appeared the film About a Boy. As a musician she sings and plays accordion in the band Molotov Jukebox. In 2015, she co-starred in the TV series Residue alongside Iwan Rheon (Ramsay Bolton from Game of Thrones).