The veteran Italian goalkeeper, 43, was alleged to have shouted ‘Porco Dio!’, which translates as ‘god is a pig’, towards Juventus team-mate Manolo Portanova.
He was initially given a €5,000 euros (£4,260) fine over an incident that took place during a Serie A clash against Parma on December 19 last year but escaped a ban.
The goalkeeper’s alleged comment was not initially proven by the Italian authorities due to a lack of clear audio but the FIGC’s Court of Appeal upheld the Federal Prosecutor’s appeal and imposed a ban.
The punishment means Buffon is ruled out of the Turin derby with Torino on Saturday April 3.
Back in 2010, the ‘Blashphemy Law’ was introduced and a number of players in Serie A have previously been caught out.