A Brisbane cafe has sparked a social media storm after its owners banned News Corp. newspapers because of perceived political bias.

A co-owner of Slightly Twisted Refreshments, in the northern Brisbane suburb of Nundah, has posted a sign explaining his decision in the cafe and on social media, where it has been widely shared.

"Rupert Murdoch (a foreign national who gave up his Australian Citizenship years ago and thus his right to a say in Australian politics) makes no apology that he is using his newspapers to subvert the political and electoral outcomes in Australia for his own economic benefit," the sign reads.

"For this reason, his newspapers The Courier-Mail and The Australian will not be available in this cafe until further notice."