The Uruguay forward will play no further part in the World Cup in Brazil after his attack on Chiellini during his side's final group game on Tuesday, a 1-0 Uruguay win which saw them progress at Italy's expense.
Fifa confirmed the news at its daily briefing in Rio de Janeiro. The player has also been fined 100,000 Swiss francs (just under £66,000).
The four-month ban would prevent Suarez playing club football for Liverpool until November but he and the Uruguay FA are able to appeal against the sanctions.
However, even if the appeal is lodged and the process is under way he will not be able play in any matches.
A statement from Fifa read: "The player Luis Suarez is to be suspended for nine official matches. The first match of this suspension is to be served in the upcoming FIFA World Cup fixture between Colombia and Uruguay on June 28, 2014.
"The remaining match suspensions shall be served in Uruguay's next FIFA World Cup match(es), as long as the team (remains in the competition), and/or in the representative team's subsequent official matches.
"The player Luis Suarez is banned from taking part in any kind of football-related activity (administrative, sports or any other) for a period of four months."
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