The federalization of Buenos Aires is, in Argentine law, the process of assigning federal status to a territory with the purpose of making that territory the national capital.
The federalization of Buenos Aires politically separated the city from the Buenos Aires Province to put it under direct control of the national government. That had been a constant aspiration of the other provinces of Argentina since the formation of the national state. However, harsh political debates around the issue prevented the federalization until 1880, more than sixty years later.