| Roman Hahun | |
| Fullname: | Roman Valentynovych Hahun |
| Birth Date: | 1993 7, df=yes |
| Birth Place: | Shepetivka, Khmelnytskyi Oblast, Ukraine |
| Currentclub: | Nyva Buzova |
| Clubnumber: | 99 |
| Position: | Defender |
| Youthyears1: | 2007–2010 |
| Youthclubs1: | Pansion Shepetivka |
| Youthyears2: | 2010–2011 |
| Youthclubs2: | Olimpik Donetsk |
| Youthyears3: | 2011–2012 |
| Youthclubs3: | Temp Shepetivka |
| Youthyears4: | 2012–2013 |
| Youthclubs4: | Olimpik Donetsk |
| Years1: | 2013–2014 |
| Caps1: | 0 |
| Goals1: | 0 |
| Years2: | 2014–2017 |
| Clubs2: | Odishi 1919 |
| Caps2: | 79 |
| Goals2: | 0 |
| Years3: | 2014–2015 |
| Clubs3: | → Odishi 1919-2 |
| Caps3: | 2 |
| Goals3: | 1 |
| Years4: | 2017–2020 |
| Caps4: | 82 |
| Goals4: | 2 |
| Years5: | 2020–2021 |
| Clubs5: | Rukh Lviv |
| Caps5: | 22 |
| Goals5: | 0 |
| Years6: | 2022–2023 |
| Clubs6: | Veres Rivne |
| Caps6: | 32 |
| Goals6: | 0 |
| Years7: | 2024– |
| Clubs7: | Nyva Buzova |
| Caps7: | 10 |
| Goals7: | 0 |
| Pcupdate: | 20 June 2024 |
Roman Valentynovych Hahun (Ukrainian: Роман Валентинович Гагун; born 16 July 1993) is a Ukrainian professional footballer who plays as a defender for Nyva Buzova.
Hahun is a product of the FC Pansion youth sportive school in his native Shepetivka. In October 2020 he signed a contract with FC Rukh Lviv, that plays in the Ukrainian Premier League.[1] In June 2022 he signed for Veres Rivne.[2]