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The 1978 Cologne Cup, also known as the Cologne Grand Prix, was a men's tennis tournament played on indoor carpet courts in Cologne, West Germany that was part of the 1978 Colgate-Palmolive Grand Prix circuit. It was the third edition of the tournament and was held from 30 October through 5 November 1978. Fourth-seeded Wojciech Fibak won the singles title and the accompanying $10,000 first-prize money
Wojciech Fibak
Peter Fleming / 
Vijay Amritraj 6–2, 0-1, ret.
Bob Hewitt /