Eliza Luella "Ella" Stewart Udall (May 21, 1855 – May 28, 1937), was an American telegraphist and entrepreneur. She was the first telegraph operator in Arizona Territory. A daughter of Mormon pioneers Levi Stewart and Margery Wilkerson Stewart, Udall was a member of the Church of Jesus Christ of Latter-day Saints her entire life. As part of the church's historical practice of polygamy, she was the first wife of David King Udall and co-wife of Ida Hunt Udall and later Mary Ann Linton Morgan. Udall also ran a successful ice cream parlor in St. Johns, Arizona and for a time managed the Apache Hotel in Holbrook, Arizona. Several of Udall's descendants went on to have influential political careers as members of the Udall family.