The 1983 ATP Championship, also known as the ATP Championships, was a men's tennis tournament played on outdoor hard courts at the Lindner Family Tennis Center in Mason, Ohio in the United States that was part of the 1983 Volvo Grand Prix. The tournament was held from August 20 through August 26, 1983. Fourth-seeded Mats Wilander won the singles title.
Mats Wilander defeated 
John McEnroe 6–4, 6–4
Victor Amaya / Tim Gullikson defeated 
Carlos Kirmayr / Cássio Motta 6–4, 6–3