The Cologne Grand Prix^[1] was a men's tennis tournament held in Cologne, West Germany, between 1976 and 1986. Also known as the Cologne Indoor Open tournament was a part of the Grand Prix tennis circuit for male tennis players and was played on indoor carpet courts.

Year	Champion	Runner-up	Score
1976	Jimmy Connors	Frew McMillan	6–2, 6–3
1977	Björn Borg	Wojciech Fibak	2–6, 7–5, 6–3
1978	Wojciech Fibak	Vijay Amritraj	6–2, 0–1, RET.
1979	Gene Mayer	Wojciech Fibak	6–3, 3–6, 6–1
1980	Robert Lutz	Nick Saviano	6–4, 6–0
1981	Ivan Lendl	Sandy Mayer	6–3, 6–3
1982	Kevin Curren	Shlomo Glickstein	2–6, 6–2, 6–3
1983	Matt Doyle	Hans-Dieter Beutel	1–6, 6–1, 6–2
1984	Joakim Nyström	Miloslav Mečíř	7–6, 6–2
1985	Peter Lundgren	Ramesh Krishnan	6–3, 6–2
1986	Jonas Svensson	Stefan Eriksson	6–7, 6–2, 6–2

Year	Champions	Runner-up	Score
1976	Bob Hewitt Frew McMillan	Colin Dowdeswell Mike Estep	6–1, 3–6, 7–6
1977	Bob Hewitt Frew McMillan	Fred McNair Sherwood Stewart	6–3, 7–5
1978	Peter Fleming John McEnroe	Bob Hewitt Frew McMillan	6–3, 6–2
1979	Gene Mayer Stan Smith	Heinz Günthardt Pavel Složil	6–3, 6–4
1980	Bernard Mitton Andrew Pattison	Jan Kodeš Tomáš Šmíd	6–4, 6–1
1981	Sandy Mayer Frew McMillan	Jan Kodeš Karl Meiler	6–0, 6–3
1982	José Luis Damiani Carlos Kirmayr	Hans-Dieter Beutel Christoph Zipf	6–2, 3–6, 7–5
1983	Nick Saviano Florin Segărceanu	Paul Annacone Eric Korita	6–3, 6–4
1984	Wojciech Fibak Sandy Mayer	Jan Gunnarsson Joakim Nyström	6–1, 6–3
1985	Alex Antonitsch Michiel Schapers	Jan Gunnarsson Peter Lundgren	6–4, 7–5
1986	Kelly Evernden Chip Hooper	Jan Gunnarsson Peter Lundgren	6–4, 6–7, 6–3

• 1981 doubles results not included on ATP website

• Cologne Open (1992)
• Bett1Hulks Indoors (2020)
• Bett1Hulks Championship (2020)