Constantin Frantzen
| Country (sports) | Germany |
|---|---|
| Born | 16 March 1998 Düsseldorf, Germany |
| Height | 1.93 m (6 ft 4 in) |
| Plays | Right-handed (two-handed backhand) |
| College | Baylor University |
| Prize money | US $428,298 |
| Singles | |
| Career record | 0–0 |
| Career titles | 0 |
| Highest ranking | No. 1226 (20 February 2023) |
| Doubles | |
| Career record | 32–40 |
| Career titles | 0 |
| Highest ranking | No. 42 (9 June 2025) |
| Current ranking | No. 49 (16 June 2025) |
| Grand Slam doubles results | |
| Australian Open | 1R (2024, 2025) |
| French Open | 2R (2025) |
| Wimbledon | QF (2024) |
| US Open | 1R (2024) |
| Last updated on: 22 June 2025. | |
Constantin Frantzen (born 16 March 1998) is a German tennis player who specializes in doubles.
Frantzen has a career high ATP doubles ranking of world No. 42, achieved on 9 June 2025.
He played college tennis at Baylor University.