Jones, who has made 95 appearances for Wales and toured twice with the British & Irish Lions, has put pen to paper on a deal with the Blues for this season.
Jones began his career with Neath in 1998 before switching to the Ospreys in 2003, where is made over 150 appearances for the region. He won the Celtic League with Ospreys on four occasions in 2004/05, 2006/07, 2009/10 and 2011/12.
Mark Hammett, Director of Rugby at Cardiff Blues, said: “Adam has joined the Blues determined to achieve something special with us. He is as hungry as ever for success and a very driven man.
“Adam wants to make a difference and that is exactly why we want him here. He will be great for the younger players to learn off and is a world class tight-head prop who will add considerably to the squad we are assembling.
“He will improve what we are doing and I’m thrilled he is now a Blue for this season.”
Adam Jones said: “This is about a new challenge for me. At this stage in my career I want a new environment and to really push myself.
“I’ve been really impressed by the set-up at Blues and the desire to achieve in the coming years under the leadership of Mark Hammett. It is that ambition and potential for the future that excites me about this move.
“Obviously I would like to thank everyone at the Ospreys – from the players and coaches to the wonderful supporters – who have been absolutely fantastic with me. I wish the region every success for the future.”
Blues sign Adam Jones
Cardiff Blues have today announced the signing of Wales and British & Irish Lions prop Adam Jones.