Catalan Republic or Catalan State refers to Catalonia at various times when it was proclaimed either an independent republic or as a republic within a Spanish federal republic:

• Catalan Republic (1640–1641), an independent state under French protection, but shortly thereafter put in a personal union with the Kingdom of France.
• Catalan State (1873), an attempt to proclaim a federated state within the First Spanish Republic.
• Catalan Republic (1931), a proclaimed state declared in expectations of the imminent formation of an Iberian Confederation of Republics. Within days, the Catalan Republic voluntarily became an autonomous region within the Second Spanish Republic.
• Catalan State (1934), a "Catalan State within the Spanish Federal Republic" proclaimed during the Events of 6 October.
• Catalan Republic (2017), a proposed state declared after the 2017 Catalan independence referendum, and immediately suspended.