| Serhiy Nahornyak | |
| Fullname: | Serhiy Mykolayovych Nahornyak |
| Birth Date: | 1971 9, df=yes |
| Birth Place: | Vinnytsia, Ukrainian SSR, Soviet Union |
| Height: | 1.86 m |
| Currentclub: | Epitsentr Kamianets-Podilskyi (manager) |
| Position: | Midfielder/Striker |
| Youthclubs1: | Vinnytsia |
| Years1: | 1992–1993 |
| Years2: | 1993 |
| Years4: | 1993 |
| Years5: | 1995 |
| Years6: | 1995–1998 |
| Years7: | 1996 |
| Years8: | 1996 |
| Years9: | 1999–2000 |
| Years10: | 1999 |
| Years11: | 2000 |
| Years12: | 2001–2003 |
| Years13: | 2004 |
| Years14: | 2004 |
| Years15: | 2005 |
| Years17: | 2007–2009 |
| Years3: | 1993–1994 |
| Clubs3: | Nyva Vinnytsia |
| Caps3: | 39 |
| Goals3: | 9 |
| Clubs4: | → Khimik Zhytomyr (loan) |
| Clubs6: | Dnipro Dnipropetrovsk |
| Clubs7: | → Spartak Moscow (loan) |
| Clubs8: | → Metalurh Novomoskovsk (loan) |
| Clubs10: | → Shakhtar-2 Donetsk |
| Years16: | 2005–2006 |
| Caps16: | 24 |
| Goals16: | 3 |
| Clubs17: | Irpin Horenychi |
| Caps2: | 1 |
| Caps4: | 4 |
| Caps5: | 10 |
| Caps6: | 60 |
| Caps7: | 2 |
| Caps8: | 1 |
| Caps9: | 17 |
| Caps10: | 4 |
| Caps11: | 26 |
| Caps12: | 74 |
| Caps13: | 14 |
| Caps14: | 16 |
| Caps15: | 15 |
| Goals1: | 7 |
| Goals2: | 0 |
| Goals4: | 1 |
| Goals5: | 0 |
| Goals6: | 14 |
| Goals7: | 0 |
| Goals8: | 2 |
| Goals9: | 3 |
| Goals10: | 0 |
| Goals11: | 12 |
| Goals12: | 18 |
| Goals13: | 1 |
| Goals14: | 3 |
| Goals15: | 1 |
| Totalcaps: | 318 |
| Totalgoals: | 82 |
| Nationalyears1: | 1994–2002 |
| Nationalteam1: | Ukraine |
| Nationalcaps1: | 14 |
| Nationalgoals1: | 0 |
| Manageryears1: | 2014–2016 |
| Managerclubs1: | Dnipro Dnipropetrovsk (assistant) |
| Manageryears2: | 2019 |
| Managerclubs2: | Ukraine U19 |
| Manageryears3: | 2020 |
| Managerclubs3: | Ukraine U16 |
| Manageryears4: | 2021 |
| Manageryears5: | 2021–2022 |
| Managerclubs5: | Epitsentr Dunaivtsi (assistant) |
| Manageryears6: | 2022 |
| Manageryears7: | 2022–2023 |
| Manageryears8: | 2022– |
| Managerclubs8: | Epitsentr Kamianets-Podilskyi |
Serhiy Mykolayovych Nahornyak (Ukrainian: Сергій Миколайович Нагорняк; born 5 September 1971) is a Ukrainian professional football coach and former player.
Nahornyak started his career at local amateur but well established football club Intehral playing at regional level. He made his debut at professional level in April 1993 in the Ukrainian First League for FC Vorskla Poltava playing against FC Avtomobilist Sumy. In the Ukrainian Premier League Nahornyak debuted for FC Nyva Vinnytsia on 8 August 1993 against FC Torpedo Zaporizhia.
In 1995 another Podolianyn Vyacheslav Hrozny invited him to FC Spartak Moscow, but Nahornyak struggled to stay in the first squad and later after dismissal of Hrozny from Spartak joined FC Dnipro Dnipropetrovsk, with which reached the 1997 Ukrainian Cup Final yielding the main trophy on penalties to FC Shakhtar Donetsk.
He played a game in the 1995–96 UEFA Champions League for FC Spartak Moscow in a 2:2 tie against FC Nantes Atlantique. Later Nahornyak also represented FC Dnipro and FC Shakhtar Donetsk in UEFA Europa League recording 5 games in total for this continental cup.