| Ioan Petcu | |
| Birth Date: | 1 May 1959 |
| Birth Place: | Hunedoara, Romania |
| Position: | Midfielder |
| Years1: | 1976–1990 |
| Caps1: | 385 |
| Goals1: | 146 |
| Years2: | 1990–1991 |
| Clubs2: | APEP Pelendriou |
| Caps2: | ? |
| Goals2: | ? |
| Years3: | 1991–1992 |
| Clubs3: | Diósgyőr |
| Caps3: | 28 |
| Goals3: | 5 |
| Years4: | 1992–1994 |
| Caps4: | ? |
| Goals4: | ? |
| Totalcaps: | 413 |
| Totalgoals: | 151 |
| Nationalyears1: | 1982–1986 |
| Nationalteam1: | Romania |
| Nationalcaps1: | 2 |
| Nationalgoals1: | 0 |
| Manageryears1: | 1995 |
| Managerclubs1: | Corvinul Hunedoara |
| Manageryears2: | 1999–2000 |
| Managerclubs2: | Cetate Deva |
| Managerclubs3: | Aurul Certej |
| Manageryears4: | 2004 |
| Managerclubs4: | Aurul Brad |
| Manageryears5: | 2004–2005 |
| Managerclubs5: | Unirea Sânnicolau Mare |
| Manageryears6: | 2005–2006 |
| Managerclubs6: | Corvinul 2005 Hunedoara |
| Manageryears7: | 2006–2008 |
| Managerclubs7: | Unirea Sânnicolau Mare |
| Manageryears8: | 2008 |
| Managerclubs8: | Corvinul 2005 Hunedoara |
| Manageryears9: | 2009 |
| Managerclubs9: | Bihor Oradea |
| Manageryears10: | 2010–2011 |
| Managerclubs10: | FC Hunedoara |
| Manageryears11: | 2012 |
| Managerclubs11: | Mureșul Deva (assistant) |
| Manageryears12: | 2018–2019 |
| Managerclubs12: | Cetate Deva |
| Manageryears13: | 2021–2023 |
| Managerclubs13: | Aurul Brad |
Ioan Petcu (born 1 May 1959, in Hunedoara) is a retired Romanian footballer who played as a midfielder. After his retirement, Petcu started the manager career and from 1995 to 2012 he coached teams like Corvinul Hunedoara, Unirea Sânnicolau Mare, Bihor Oradea, FC Hunedoara or Mureșul Deva. He also promoted to Liga II with Unirea Sânnicolau Mare, the best performance in the history of this club. After 2012 he was the vice-president of FC Hunedoara. From June 2018 he is the manager of Liga III side Cetate Deva.