Amalfitano has made 22 appearances for Sam Allardyce???s side since joining from Marseille in the summer.
The 29-year-old scored on his home debut in the 3-1 win over Liverpool in September and has also netted against Manchester City and Hull.
Amalfitano???s new deal will now see him feature in West Ham???s final season at the Boleyn Ground and the first at their new Stadium in 2016
“I am pleased,” he told West Ham TV. “It’s the culmination of a good year. We’re always trying to do our best and so I’m very pleased to have signed for two more years.
“I think I’ve impressed the management, I know that I can always do better and I hope to do so. I’ll give it my all as I have done in the first eight months.
“I’ve not had a chance to see the Olympic Stadium yet but apparently it’s a very, very beautiful stadium. So I’m very pleased to be a part of the project and I always want to please our fans, as much as possible.”
Amalfitano is available again for Allardyce after serving a three-match ban followng his sending off against West Brom.
“It’s been a little while that I couldn’t play and it’s been a little bit frustrating,??? he added. ???So it’s a pleasure to get back out on the pitch and play games. I’ve trained as hard as I possibly could in these past few weeks and now I’m ready for Saturday.
“We need to get back to winning games and it’s down to us to rally ourselves to win the next games and hopefully that will start against a great team in Arsenal on Saturday.”