| Helmut Trettwer | |
| Fullname: | Helmut Trettwer |
| Birth Date: | 29 September 1983 |
| Discipline: | Road |
| Role: | Rider |
| Amateuryears1: | 2006–2007 |
| Amateurteam1: | RSV Götting-Bruckmühl |
| Amateuryears2: | 2008–2009 |
| Amateurteam2: | RSV 1948 Traunstein |
| Amateuryears3: | 2008–2009 |
| Amateurteam3: | Herbalife–Focus |
| Amateuryears4: | 2010–2012 |
| Amateurteam4: | Team Baier Landshut |
| Amateuryears5: | 2011 |
| Amateurteam5: | A:xus–Bikemoments.com |
| Amateuryears6: | 2013–2014 |
| Amateurteam6: | RSV Irschenberg |
| Amateuryears7: | 2013 |
| Amateurteam7: | Rudy Project Racing Team |
| Amateuryears8: | 2014 |
| Amateuryears9: | 2015 |
| Amateurteam9: | Team Baier Landshut |
| Proyears1: | 2016–2019 |
| Proyears2: | 2020– |
| Proteam2: | [1] |
Helmut Trettwer (born 29 September 1983) is a German racing cyclist, who currently rides for UCI Continental team .[2] He rode for in the men's team time trial event at the 2018 UCI Road World Championships.[3]