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The effect of nanoconfinement on the glass transition temperature in thin polymer films is studied as a function of added small-molecule diluent or plasticizer. The decrease [increase]For examplein found in nanoconfined, neat polystyrene [poly(2-vinyl pyridine)] is suppressed by added diluent, with 13–20 nm thick polystyrene films exhibiting bulk upon addition of 9 wt % pyrene or 4 wt % dioctylphthalate. This is explained by a connection between the size scale of the cooperative dynamics associated with , which decreases with added diluent, and the size scale of the nanoconfinement effect.