Midfielder joins The Iron on a loan deal until the end of the season.
The 22-year-old arrived at Oakwell in the summer of 2017 from Sky Bet League Two side Luton Town.
Scunthorpe currently occupy 4th spot in Sky Bet League One as they aim to return to the Sky Bet Championship for the first time since the 2010/11 season.
Making his debut away at Millwall in the 3-1 victory over the Lions, McGeehan showed his qualities with a stunning switch of play which led to the second goal of the match and an excellent three points. His next big moment for Paul Heckingbottom's side was an excellent header, which opened his Sky Bet Championship account in the 2-2 home draw with Middlesbrough.
With nine appearances to his name so far, first team opportunities have been limited for the midfielder this season and a loan now gives the perfect chance for McGeehan to gain the vital football he needs in order to continue his development.
Everyone at Barnsley Football Club wants to wish Cameron the best of luck for the remainder of the season and we will be keeping fans up to date with his progress.