Robert Arsiaga (1979-4 April 2004) was a US Army specialist who served in the US Army during the Iraq War. Born in Greenwood, Texas, he joined the Army in 1998 and was assigned to 2nd Battalion, US 5th Cavalry Regiment, US 1st Cavalry Division at Fort Hood. He was deployed to Sadr City, Baghdad in April 2004, and he was killed in action with the Shia Mahdi Army at the start of the Siege of Sadr City.