The 1979 European Indoor Championships, 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 1979 Colgate-Palmolive Grand Prix circuit. It was the fourth edition of the tournament and was held from 29 October through 4 November 1979. First-seeded Gene Mayer won the singles title.
Gene Mayer defeated 
Wojciech Fibak 6–3, 3–6, 6–1
Gene Mayer / Stan Smith defeated Heinz Günthardt / Pavel Složil 6–3, 6–4