The Morocco striker has signed a 'long-term contract' - believed to be for five years and worth £50,000 a week - after letting his contract run down at Bordeaux.
"I’m very excited about playing at Emirates Stadium. I have heard many great things about the stadium and I cannot wait to be playing there in an Arsenal shirt.
"I will give my best to this club. We have many great players and I will be giving everything to help the team win trophies next season.”
Wenger said: “We are delighted that Marouane Chamakh has joined us. He is a player we have admired for some time.
“Chamakh has proved he is a great player with his performances for Bordeaux and Morocco in recent seasons and we’re all looking forward to him joining us.
“Chamakh is a striker of real quality and has all the attributes suited to come to England and do very well.
“He is also a fighter, not only a good football player, but a fighter as well. He is very good in the air and also a good team player. He is a great addition to our squad.”