Question: who plays olivia on law and order svu
Answer: Mariska Magdolna Hargitay ( / məˈrɪʃkə ˈhɑːrɡɪteɪ / mə - RISH - kə HAR - gi - tay ; born January 23 , 1964 ) is an American actress best known for her role as Detective / Sergeant / Lieutenant Olivia Benson on the NBC drama series Law & Order : Special Victims Unit , for which she has earned multiple awards and nominations , including winning a Primetime Emmy Award and Golden Globe Award .