David Roach (born August 9, 1985 in Abilene, Texas) is an American football safety who was last known as a member of the Detroit Lions. He was signed by the New Orleans Saints as an undrafted free agent in 2008 and stayed for six games as a member of their practice squad. Roach spent two seasons with the St. Louis Rams (October 2008-August 2010) after being released from the New Orleans Saints in October of 2008. He played college football at Texas Christian.