The 31-year-old midfielder had just three months left on his previous deal with the French champions, but has been a regular starter for Leonardo Jardim's side this term.
The Principality outfit look set to lose their Ligue 1 crown to Paris Saint-Germain, who are 17 points clear at the top of the table, but Moutinho is hoping to win another trophy this weekend to repay the faith shown by the club in handing him a two-year extension.
Les Monegasques face PSG in the Coupe de la Ligue final on Saturday - a repeat of last year's event when Les Parisiens ran out 4-1 victors to deny them a domestic double.
"I am very happy to extend my contract with AS Monaco," Moutinho told the club's official website.
"These years have been very positive on a personal level but also as collective with very beautiful runs in the Champions League and winning the French title.
"I feel very good in Monaco, I will continue to give the best of myself to help AS Monaco achieve its goals."
The Portugal international has made 184 competitive appearances for Monaco since his arrival from FC Porto in 2013.
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