| João Mário | |
| Full Name: | João Mário Ferreira Oliveira |
| Birth Date: | 28 December 1966 |
| Birth Place: | Porto, Portugal |
| Position: | Midfielder |
| Currentclub: | Olympiacos (assistant) |
| Youthyears1: | 1981–1985 |
| Youthclubs1: | Porto |
| Years1: | 1985–1987 |
| Clubs1: | Paços de Ferreira |
| Years2: | 1987–1992 |
| Clubs2: | Braga |
| Caps2: | 126 |
| Goals2: | 1 |
| Years3: | 1992–1993 |
| Clubs3: | Tirsense |
| Caps3: | 33 |
| Goals3: | 1 |
| Years4: | 1993–1994 |
| Clubs4: | Famalicão |
| Caps4: | 29 |
| Goals4: | 1 |
| Years5: | 1994–1996 |
| Clubs5: | Tirsense |
| Caps5: | 11 |
| Goals5: | 0 |
| Years6: | 1996–1997 |
| Clubs6: | Beira-Mar |
| Caps6: | 24 |
| Goals6: | 0 |
| Years7: | 1997–1998 |
| Clubs7: | Moreirense |
| Caps7: | 14 |
| Goals7: | 0 |
| Years8: | 1998–1999 |
| Clubs8: | Gondomar |
| Years9: | 1999–2000 |
| Clubs9: | Paredes |
| Manageryears1: | 2000–2002 |
| Managerclubs1: | Paredes (assistant) |
| Manageryears2: | 2002 |
| Managerclubs2: | Paredes |
| Manageryears3: | 2002–2003 |
| Managerclubs3: | Freamunde |
| Manageryears4: | 2004–2005 |
| Managerclubs4: | Moreirense (youth) |
| Manageryears5: | 2005–2007 |
| Managerclubs5: | Varzim (assistant) |
| Manageryears6: | 2007–2008 |
| Managerclubs6: | Vitória Setúbal (assistant) |
| Manageryears7: | 2008 |
| Managerclubs7: | Asteras Tripolis |
| Manageryears8: | 2009 |
| Managerclubs8: | Marítimo (scout) |
| Manageryears9: | 2009–2010 |
| Managerclubs9: | Sporting CP (assistant) |
| Manageryears10: | 2011–2012 |
| Managerclubs10: | Beşiktaş (scout) |
| Manageryears11: | 2012 |
| Managerclubs11: | İstanbul Başakşehir (assistant) |
| Manageryears12: | 2013–2015 |
| Managerclubs12: | Shabab Al Ahli (youth) |
| Manageryears13: | 2015–2017 |
| Managerclubs13: | Sheffield Wednesday (assistant) |
| Manageryears14: | 2017–2018 |
| Managerclubs14: | Swansea City (assistant) |
| Manageryears15: | 2019–2020 |
| Managerclubs15: | Rio Ave (assistant) |
| Manageryears16: | 2020–2022 |
| Managerclubs16: | Braga (assistant) |
| Manageryears17: | 2022 |
| Managerclubs17: | Al Wahda (assistant) |
| Manageryears18: | 2022–2023 |
| Managerclubs18: | Celta (assistant) |
| Manageryears19: | 2023– |
| Managerclubs19: | Olympiacos (assistant) |
João Mário Ferreira Oliveira (born 28 December 1966), known as João Mário (pronounced as /pt/), is a Portuguese former professional footballer who played as a midfielder and is currently an assistant manager to Carlos Carvalhal at Super League Greece club Olympiacos.
He made 199 appearances during 9 seasons in the Primeira Liga for Braga, Tirsense and Famalicão.
After the end of his playing career, João Mário remained active in the football world, being part of Carlos Carvalhal's coaching staff at Vitória de Setúbal, Asteras Tripolis, Marítimo, Sporting CP, Beşiktaş, İstanbul Başakşehir F.K., Sheffield Wednesday, Swansea City, Rio Ave, Braga, Al Wahda, Celta de Vigo and Olympiacos.[1]
He made his Primeira Liga debut for Braga on 29 August 1987 as a starter in a 0–0 draw against Salgueiros.[2]
His son João Cunha is a professional footballer.