Oscars 2012: Meryl Streep wins for lead actress Meryl Streep won the Oscar for lead actress Sunday at the 84th Academy Awards, for her role playing former British Prime Minister Margaret Thatcher in "The Iron Lady." Though the film itself was greeted with mixed reviews, Streep's performance received universal acclaim. In the film, Streep portrays Thatcher throughout her life and career, beginning in her later years and looking back. This was Streep's third Oscar for lead actress, but her first since "Sophie's Choice" in 1982. Additionally, it was her 17th overall nomination. Earlier in the season, she picked up a Golden Globe Award for actress in a drama. It was her eighth Golden Globe (the most for any performer) and her 26th overall nomination. She competed against Viola Davis in "The Help," Michelle Williams in "My Week With Marilyn," Glenn Close in "Albert Nobbs" and Bérénice Bejo in "The Artist." Photo: Meryl Streep.