Diane Joyce Humetewa (born December 5, 1964) is a United States District Judge of the United States District Court for the District of Arizona and was the United States Attorney for the District of Arizona, serving in that position from December 2007 to August 2009. On September 19, 2013, President Barack Obama nominated Humetewa to serve as a United States District Judge of the United States District Court for the District of Arizona, to the seat vacated by Judge Mary H. Murguia, who was elevated to the United States Court of Appeals for the Ninth Circuit on January 4, 2011. She received her judicial commission on May 16, 2014.