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Castile or Castilia or Castilla may refer to:

• , an overview of the former kingdom, culture, and land that gradually merged with its neighbors to become the Kingdom of Spain
• Old Castile, the northern region of Castile
  • Castile and León, an autonomous community of modern Spain roughly similar to Old Castile
• New Castile (Spain), the southern region of Castile
  • Castile-La Mancha, an autonomous community of modern Spain roughly similar to New Castile
• Kingdom of Castile, one of the medieval kingdoms of the Iberian Peninsula
• Crown of Castile, the combined kingdoms controlled by Castile considered to have begun with the union of León with Castile in 1230

Other places

• Governorate of New Castile, the initial Spanish colony in South America that would eventually become the Viceroyalty of Peru
• Castilla de Oro, an old name for a region in Central America
• Castilla, Sorsogon, 3rd class municipality in Philippines
• Castile, New York, both a village and a town located in Wyoming County, New York

Ships

• Spanish cruiser Castilla, a Spanish Navy cruiser that fought in the Battle of Manila Bay during the Spanish-American War

People

• Brooke Castile
• Javier Castilla, Colombian squash player
• Simeon Castille, a cornerback in the NFL.

Botany and Zoology

• Castilia (butterfly), a butterfly genus
• Castilla (plant), a tree genus belonging to the family Moraceae
• Castilla (Vino de la Tierra), a Spanish geographical indication for wine

Other uses

• Real Madrid Castilla, the reserve team of Real Madrid
• Sponge cake made in Nagasaki, Japan. Originally introduced by Portuguese traders.
• Castile soap, a name used in English-speaking countries for soap made exclusively from vegetable oil