Bilic has been the hot favourite to land the post after the club failed to land Rafa Benitez as manager – however Bilic has always been a firm favourite with the fans.
“It is a big privilege and a big responsibility to now be manager and I hope that I will prove it to the board, players and fans,” the new Irons manager told the clubs website.
“When I spoke to the chairmen and Karren Brady, they made clear that it is not only the fantastic new [Olympic] Stadium we are moving into, but they showed their determination and ambition to make what is a big club even bigger.
“I could feel that they really wanted me so it was an easy choice. I would say to the West Ham fans that I will give my best and together we will achieve great things.
“I remember West Ham as a special club. My last club, Besiktas, was that kind of club. It’s not about the size – there is something special about them – they are a cult club.”