Bangura, who was recommended to the Bhoys by club legend Henrik Larsson, has signed a four-year contract with the Scottish side.
“We believe Mohamed is a player of real quality and someone who has the potential to make a big contribution to Celtic,” Celtic boss Neil Lennon told the club’s official website.
“He comes highly recommended by people in the Swedish game. We have had him watched for a year or so, and all the reports have been very positive, and I know Mohamed is excited about joining the club.
“He’s a young player and someone with great enthusiasm for Celtic and for the challenge ahead, and we’re really looking forward to welcoming him to the squad.”
Bangura said: “I am delighted to be joining a club the size of Celtic.
“I’m flattered that someone like Henrik Larsson would recommend me. I know all about Henrik and what a great player he was for Celtic, and I’m looking forward to joining up with my new team-mates and working hard to do well at Celtic and help the club be successful.”