Olsen started her affairs with Matt Kaplan, her school life sweetheart on 2004 and they split up after three years of dating on 2007. Then she began dating with fellow actor Justin Bartha. She split up with her boyfriend on March 2011 after almost three years of dating. In 2013 she started relationship with the businessman David Schulte for six months. As of January 2014 she is in relationship with director Bennett Miller and it is rumored that they are trying to have children. In 2009 she filed a $40 million lawsuit against Tabloid Magazine National Enquirer for depicting her as being involved in a drug scandal.
She has several health disorders like Attention deficit hyperactivity disorder, and Lyme disease and she is having medicine for these. She is not married yet. As she has never been married, there is no question of a divorce in her life.