The Irishman, who will be reunited with Stuart McCall and Kenny Black, has signed a 1 year deal.
Bradford City have completed the signing of experienced forward Billy Clarke, who returns for his third spell with the Bantams.
Clarke has put pen to paper on a one-year deal to be reunited with Stuart McCall and Kenny Black at Valley Parade.
The Irishman first joined City in 2014, scoring 25 goals in 144 games, before spending a further four months in West Yorkshire - last year.
The former Charlton Athletic attacker enjoyed a successful spell at Grimsby Town during the 2019/20 season, prior to the campaign’s curtailment.
Clarke is thrilled to have returned to the club where he holds a wealth of personal memories.
He said: “I am absolutely over the moon to be back here, again. I was devastated to leave last time and to get the chance to return is unbelievable.
“The time I had with Stuart McCall and Kenny Black was brilliant and we were close to achieving big things. It was the most enjoyable season of my career - to date.
“I am determined to right the wrongs and bring my experience and quality back. Hopefully, we can enjoy a really successful season.”
City boss McCall is looking forward to working with Clarke for the second time in his career.
He added: "Billy is a player Kenny and I obviously know very well, and one who knows this football club inside out.
"He was part of a team we had in our previous spell here which came so close being successful, so he probably feels there is a little bit of unfinished business.
"I am naturally aware his second spell was not as memorable, but the reason for bringing Billy back is based not only on his quality and character, but also on his performances for a Grimsby Town side which was resurgent after he joined them, last season.
"I know how desperate his former manager, Ian Holloway, was to re-sign him - as were Grimsby's supporters.
"After studying many of his games closely in recent months, I know he still has the fitness and desire to come back here and be a success with us.
"He fits into our mentality of setting high standards, both in matches and on the training ground, and has the strong belief and positive mindset we want to see in all of our players."
Clarke’s move is subject to the relevant EFL and FA clearances.