Alternative History
Republic of Castile and Leon
República de Castilla y León (Castilian)
República de Castiella y Lleón (Asturleonese)
Castile
Timeline: Triangles and Crosses
OTL equivalent: Crown of Castile, except Galicia (territory)
Flag of Castile and Leon (TaC) Coat of arms of Castile (Triangles and Crosses)
Flag Coat of arms
Anthem: 
Madre Castilla
Map of Castile and Leon (TaC)
Localization of Castile.
CapitalMadrid
Other cities Seville
Málaga
Córdoba
Official languages Castilian
Asturleonese
Religion Secular state
Demonym Castilian
Leonese (inhabitants of Leon)
Government Federal presidential constitutional republic
 -  President Pablo Casado
 -  Vice President Pedro Sánchez
 -  President of the Senate Pilar Llop
 -  President of the Congress of Deputies Óscar López
Legislature Cortes Generales
 -  Upper house Senate
 -  Lower house Congress of Deputies
EstablishmentAllied-occupied Spain
 -  Provisional rule of Juan I August 15th, 1946 
 -  Proclamation of the Castilian Republic October 6th, 1949 
 -  Current constitution May 19th, 1960 
Area
 -  Total 233,952 km2 
90,329 sq mi 
Population
 -  2018 estimate 13,186,315 
Gini (2018) 30.8 (medium) 
HDI (2018) 0.901 (very high) 
Currency Euro (€) (EUR)
Time zone UTC (WET)
Date formats dd/mm/yyyy
Drives on the right
Internet TLD .ca
Calling code +34

The Republic of Castile and León (Castilian: República de Castilla y León, Asturleonese: República de Castiella y Lleón), or shortly, Castile, is a country located at the center of the Iberian Peninsula. The country borders United Republics to the west, Aragon to the east, the Basque Country to the northeast, the Atlantic Ocean to the north and southwest, the Mediterranean Sea to the southeast, and the Strait of Gibraltar to the south. With the capital in Madrid, Castile is generally referred to as the legal successor of Spain.

Commonly referred to as the "New Castile", the republic originated after the Second World War, when Spain joined the Axis Powers but was the last country to be defeated in the European Theatre. The occupation of Spain eventually brought the dissolution of Spain as a proper state, as Catalonians, Galicians, Basques, and many other minorities claimed and declared several independent states from the occupied areas. Ultimately, Spain was divided into four major states: Aragon, Basque Country, Castile, and Galicia; the Canary Islands, and the city-state of Melilla.

In the early period, Don Juan, previously King of Spain, was designated as provisional head of state of Castile, but due to the resentment of the population over the Spanish Crown following the Second World War, in 1949 the population chose the republican system over the monarchy. Most of the monarchists in Castile are recluse to the conservative People's Party, and the National Action (unofficial, but legalized successor from CEDA).

Currently, Asturian and Leonese autonomism had been rising since the end of the Second World War, calling up for political reforms, federalization of the nation, and more inclusion for the Asturian and Leonese-majority provinces in Castile, similarly to the United Republics and the Aragonese Commonwealth. A referendum held in early 2022 turned Castile into a federal state with León.

Castile is a secular republican democracy with a presidential system, with Pablo Casado as the President. It is a major developed country, a high-income country, and considered one of the most free countries in Europe according to the independent source of the Freedom of the World index. It is a member of the Society of Nations, the European Union, the Council of Europe, the Organization of Ibero-American States, the North Atlantic Treaty Organization, the Iberian Federation, the World Trade Organization, and many other international organizations.