Natalia Gastiain Tena (born c. 1984) is an English actress.
Tena is of Spanish descent. She was educated at Bedales School, the same school as Minnie Driver and Daniel Day-Lewis.
Tena made her professional debut as Ellie in About a Boy (2002). She has played lead roles in stage adaptations of Gone to Earth in 2004, and Nights at the Circus, and has appeared in smaller roles in other productions. She last appeared in Harry Potter and the Order of the Phoenix as Nymphadora Tonks.