Croatian Bilic was sacked following a meeting with club officials.
West Ham had dropped into the relegation zone after a 1-4 home defeat by Liverpool left them with two wins in 11 league games.
“It’s a big job we have in hand now, but I‘m sure with everybody together we can get the right results between now and the end of the season,” Moyes said in a video posted on West Ham’s Twitter account.
Joint Chairman David Sullivan said the club would benefit from Moyes’ experience in the Premier League.
“We need somebody with experience, knowledge of the Premier League and the players in it, and we believe David is the right man to turn things around and get the best out of the players at the club,” Sullivan said in a statement.
“He is highly regarded and respected within the game, and will bring fresh ideas, organisation and enthusiasm.”
The former Everton manager coached Sunderland last season but stepped down following the club’s relegation to the Championship.
Moyes’ stock has fallen considerably in recent years, following an unsuccessful spell at Spanish side Real Sociedad and an ill-fated stint as Alex Ferguson’s successor at Manchester United in 2013/2014.
-Reuters/NAN PLACE YOUR TEXT ADVERT BELOW:>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> How I Made Me =N=2.5 MILLION In 7 Days from 2 Common Product I Imported and how you can do the same. Click HERE FOR FREE Details right now Warning To Men: This 3 Foods Is Killing Your Erection. Click Here To Know Them Secret Fruits that increased my Manhood and makes me last 55 minutes+ all time - Click here to get it Warning: Got Arthritis? 3 Simple Ways To Get Cured And Be Permanently Free From Joint Pains. Click Here To See Them REVEALED!! Reduce Your Blood Sugar Level And Reverse Diabetics Within A Short Period Of Time. Click Here To See How MIDNIGHT,Pressed Mr Kilanko Suddenly Couldn't Urinate. Shrink your Enlarged Prostrate Here! Click Here Now