Markus Günthardt (born 10 September 1957 in Zürich, Switzerland) is a former Swiss tennis player. Günthardt won three doubles titles during his professional career. The right-hander reached his highest ATP doubles ranking on 17 September 1984, when he became the number 44 in the world.
Günthardt participated in 14 Davis Cup ties for Switzerland from 1980–86, posting a 9-5 record in doubles.
Günthardt's younger brother Heinz was a successful doubles player, winning two Grand Slam doubles titles in his career.
| Outcome | No. | Date | Tournament | Surface | Partner | Opponents in the final | Score in the final |
|---|---|---|---|---|---|---|---|
| Winner | 1. | 1980 | Båstad, Sweden | Clay | Heinz Günthardt | John Feaver Peter McNamara |
6–4, 6–4 |
| Runner-up | 1. | 1980 | Geneva, Switzerland | Clay | Heinz Günthardt | Željko Franulović Balázs Taróczy |
4–6, 6–4, 4–6 |
| Winner | 2. | 1981 | Gstaad, Switzerland | Clay | Heinz Günthardt | David Carter Paul Kronk |
6–4, 6–1 |
| Runner-up | 2. | 1981 | Basel, Switzerland | Hard (i) | Pavel Složil | José Luis Clerc Ilie Năstase |
6–7, 7–6, 6–7 |
| Runner-up | 3. | 1982 | Cairo, Egypt | Clay | Heinz Günthardt | Drew Gitlin Jim Gurfein |
4–6, 5–7 |
| Runner-up | 4. | 1982 | Gstaad, Switzerland | Clay | Heinz Günthardt | Sandy Mayer Ferdi Taygan |
2–6, 3–6 |
| Runner-up | 5. | 1983 | Madrid, Spain | Clay | Zoltan Kuharszky | Heinz Günthardt Pavel Složil |
3–6, 3–6 |
| Winner | 3. | 1984 | Gstaad, Switzerland | Clay | Heinz Günthardt | Givaldo Barbosa João Soares |
6–4, 3–6, 7–6 |