Castile

Castile or Castilia can mean:

Kingdom of Castile, the historical kingdom from the 9th to the 13th century
Crown of Castile, the historical Kingdom formed in 1230 from the union of the Kingdom of Castile and Kingdom of León
Castile-La Mancha, an autonomous community of Spain formed in 1982, composed of five provinces: Albacete, Ciudad Real, Cuenca, Guadalajara and Toledo
Castile and León, an autonomous community of Spain formed on February 25, 1983, composed of 9 provinces, six Castilian and three Leonese: León, Zamora, Salamanca, Ávila, Burgos, Palencia, Segovia, Soria and Valladolid
Old Castile, the political name of the region formed by Santander, Burgos, Logroño, Soria, Segovia, Ávila, Valladolid and Palencia. It had some territorial changes in its History, and had this name from 18th century to 1983. It no longer exists
New Castile, the political name of the region formed by  Ciudad Real, Cuenca, Guadalajara, Madrid, Toledo and part of Albacete. It took this name in the 18th century and disappeared with democracy. It no longer exists

Other
Real Madrid Castilla, a Spanish football team. It is the reserve team of Real Madrid
Castile soap, a name used in English-speaking countries for soap made exclusively from vegetable oil
Castilia (butterfly), a butterfly genus
Castella, a kind of sponge cake popular in Japan. The name comes from the Portuguese phrase pão de Castella, meaning "bread from Castile"