Peter Nyborg (born December 12, 1969, in Gothenburg, Sweden), is a former professional tennis player from Sweden. He enjoyed most of his tennis success while playing doubles. During his career he won 5 doubles titles. He achieved a career-high doubles ranking of World No. 38 in 1996.
| Outcome | No. | Date | Tournament | Surface | Partner | Opponents in the final | Score in the final |
|---|---|---|---|---|---|---|---|
| Winner | 1. | 1993 | Seoul, South Korea | Hard | Jan Apell | Neil Broad Gary Muller |
5–7, 7–6, 6–2 |
| Runner-up | 1. | 1994 | Rosmalen, Netherlands | Grass | Diego Nargiso | Stephen Noteboom Fernon Wibier |
3–6, 6–1, 6–7 |
| Winner | 2. | 1995 | Copenhagen, Denmark | Carpet | Mark Keil | Guillaume Raoux Greg Rusedski |
6–7, 6–4, 7–6 |
| Runner-up | 2. | 1995 | Basel, Switzerland | Hard (i) | Mark Keil | Cyril Suk Daniel Vacek |
6–3, 3–6, 3–6 |
| Runner-up | 3. | 1996 | Marseille, France | Hard | Marius Barnard | Jean-Philippe Fleurian Guillaume Raoux |
3–6, 2–6 |
| Runner-up | 4. | 1996 | St. Petersburg, Russia | Carpet | Nicklas Kulti | Yevgeny Kafelnikov Andrei Olhovskiy |
3–6, 4–6 |
| Runner-up | 5. | 1996 | Båstad, Sweden | Clay | Joshua Eagle | David Ekerot Jeff Tarango |
4–6, 6–3, 4–6 |
| Winner | 3. | 1997 | Milan, Italy | Carpet | Pablo Albano | David Adams Andrei Olhovskiy |
6–4, 7–6 |
| Runner-up | 6. | 1998 | Stockholm, Sweden | Hard (i) | Chris Haggard | Nicklas Kulti Mikael Tillström |
5–7, 6–3, 5–7 |
| Winner | 4. | 1999 | Kitzbühel, Austria | Clay | Chris Haggard | Álex Calatrava Dušan Vemić |
6–3, 6–7, 7–6 |
| Winner | 5. | 2002 | Bucharest, Romania | Clay | Jens Knippschild | Emilio Benfele Alvarez Andres Schneiter |
6–3, 6–3 |