The 20-year-old, who has made four appearances for the Robins this term, links up with former City midfielder and new Latics boss Lee Johnson at Boundary Park.
"The gaffer was at Bristol City when I was starting out and knows about me," Reid told Oldham's official website.
"It has reached the stage of my career when I need to be playing games and getting experience which is why I am happy to be here."
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