Gileño (also Apaches de Gila, Apaches de Xila, Apaches de la Sierra de Gila, Xileños, Gilenas, Gilans, Gilanians, Gila Apache, Gilleños) was the name used to refer to several different Apachean and non-Apachean groups at different times. Gila refers to either the Gila River or the Gila Mountains.
Some of the Gila Apaches were probably later known as the Mogollon Apaches, a subdivision of the Chiricahua, while others probably evolved into the Chiricahua proper. However, since the term was used indiscriminately for all Apachean groups west of the Rio Grande (i.e. in southeast Arizona and western New Mexico), the reference is often unclear. After 1722, Spanish documents start to distinguish between these different groups; Apaches de Gila comes to mean Western Apaches living along the Gila River (and thus synonymous with Coyotero).
American writers first used the term to refer to the Mimbres (another subdivision of the Chiricahua). Later the term was confusingly used to refer to Coyoteros, Mogollones, Tontos, Mimbreños, Pinaleños, Chiricahuas, as well as the non-Apachean Yavapai (then also known as Garroteros or Yabipais Gileños). Another Spanish usage (along with Pimas Gileños and Pimas Cileños) referred to the non-Apachean Pima living on the Gila River.