The siege of Albarracín was a battle fought during the reign of Peter III of Aragon, King of Aragón from the months of April to September 1284. Albarracín, which had for some time belonged to Juan Núñez I de Lara, the head of the House of Lara, was besieged by an Aragonese force. The siege resulted in the successful taking of the city by Aragonese forces after which, Peter III handed gifted the city to his illegitimate son, Ferdinand of Aragón.

The Lordship of Albarracín was an independent Christian lordship in the Kingdom of Aragón located in and around the city of Albarracín. Its location was a buffer wedged between the Kingdom of Aragón and the Kingdom of Castile. The Señorío was created after the partition of the Taifa of Albarracín belonging to the Berber line of Banu Razín.