The former Wolves youth player has commited to the Leesiders for another year and says that he is looking ahead to the new season
The 21-year-old joined the Leesiders from English Championship side Wolves in January 2012 and went on to make 22 league appearances in his debut season with the club.
Speaking to corkcityfc.net after signing his new contract, Dunleavy said: "I am pleased to have signed a new contract and I am really excited about next season."
He added: "I really enjoyed my first year in Cork, and from my point of view it went really well, so I hope that we can push on next year and finish higher up the table.
"We are all working hard already in the close-season and we want to improve on last season. We are working on the physical side of things now so that we can come back in for pre-season in good shape and look to push on and aim for a top four finish."
Cork City manager Tommy Dunne praised the Donegal-born player's attitude and aptitude during his first season with the club and said that he was 'delighted' to have him on board.
"Johnny is a good lad and he did well for us last season. It was his first full, proper season of first team football, and I am hoping that he will push on now this season.
"He did very well last season, before he suffered an ankle injury, but he came back into the side and did very well, so I am delighted that we will have him on board for another season," concluded Dunne.