Miranda Otto (born 16 December 1967) is an Australian actress. She is the daughter of actors Barry and Lindsay Otto and the paternal half-sister of actress Gracie Otto. Otto began her acting career in 1986 at age 18 and appeared in a variety of independent and major studio films in Australia. She made her major film debut in Emma's War in 1987 in which she played a teenager who moves to Australia's bush country during World War II.

After a decade of critically acclaimed roles in Australian films, Otto gained Hollywood's attention during the 1990s after appearing in supporting roles in the films The Thin Red Line and What Lies Beneath. She rose to fame in the early 2000s for playing Éowyn in Peter Jackson's The Lord of the Rings film series, based on the classic fantasy novel of the same name by English author J. R. R. Tolkien.