Terry Connor joins the Welsh club as assistant manager, while James Rowberry and Andy Dibble continue in their roles as first-team coach and goalkeeping coach respectively.
“I’m delighted to be here,” McCarthy told Cardiff City TV. “I’m thrilled by the opportunity.
“I want to get the club back to winning games and I want to get smiles back on the players’ faces. If we do that, then we’ll get smiles back on the fans.
“We’ve got a good squad of players and I’m looking forward to getting down to work.”
Mick McCarthy’s last club job in English football was at Ipswich in 2018 (Joe Giddens/PA)