Carl Johnston is a 24-year-old professional football player from NIR. He currently plays for Peterborough United, wearing the number 2 shirt. At the international level, he represents Northern Ireland U21. He plays primarily as a Defender. His current market value is estimated at 250K €.

His most recent move was a Free from Fleetwood Town to Peterborough United on 2025-01-04. The reported fee was 0.36M €.

Throughout the English Football League One 2025-2026, Carl Johnston featured in 31 matches, averaging 1 tackles, 1 interceptions, and 2.9 clearances per game, while blocking 0.2 shots per game.