Edwin Frederick O'Brien (born April 8, 1939) is an American Cardinal. He is the current Grand Master of the Equestrian Order of the Holy Sepulchre of Jerusalem since his appointment by Pope Benedict XVI on March 15, 2012, having previously served as Pro-Grand Master since his original appointment on August 29, 2011. He had previously held positions as 15th Archbishop of Baltimore from 2007 to 2011, and as 7th Archbishop for the Military Services from 1997 to 2007.