Mark Robert Filip (born June 1, 1966) is an American lawyer specializing in class action and white collar criminal and regulatory defense. Formerly a partner at Skadden, Arps, he currently practices in the Washington, D.C. office of Kirkland and Ellis. From 2004 until 2008, Filip served as a United States District Judge of the United States District Court for the Northern District of Illinois. As the George W. Bush administration ended, Filip served as Deputy Attorney General of the United States, and as the Barack Obama administration began he briefly served as Acting Attorney General (from January 20, 2009 to February 3, 2009).