Luis E. Fonseca, Jr. (born 1980) is a United States Navy hospital corpsman who was awarded the Navy Cross for extraordinary heroism on March 23, 2003, while assigned to a Marine Corps amphibious assault vehicle platoon serving with the 1st Battalion, 2nd Marine Regiment, during the Battle of An Nasiriyah in An Nasiriyah, Iraq. This was the first major battle fought in Iraq by the U.S Marine Corps (and U.S. Army) during Operation Iraqi Freedom.