270 of 21 December 2005 was a proportional electoral law with a majority prize and blocked lists that regulated the election of the Chamber of Deputies and the Senate in Italy in 2006, 2008 and 2013.

It was nicknamed Porcellum by Giovanni Sartori after its author, Roberto Calderoli, defined it a "porcata" (rascality) in a TV show.

[1] Commissioned by Silvio Berlusconi, who on 4 October 2005 "threatened a government crisis in the event that a proportional electoral reform was not approved", the law was approved a few months before the general election with the votes of the House of Freedoms (mainly Forza Italia, National Alliance, Northern League and Union of Christian and Centre Democrats), without the consent of the opposition (mainly Democrats of the Left, The Daisy and the Communist Refoundation Party), which criticized and opposed it.

[3] The remaining part of the law (now colloquially referred to as Consultellum by the press) resulted in a pure proportional system.

To protect the recognized linguistic minorities it was envisaged that the lists representing them, whether coalitioned or not, could still have access to the allocation of seats for the Chamber of Deputies obtaining at least 20% of the votes in the constituency in which they compete.