| Piotr Zajączkowski | |
| Birth Date: | 1966 3, df=yes |
| Birth Place: | Orneta, Poland |
| Height: | 1.73 m |
| Position: | Midfielder |
| Currentclub: | Stomil Olsztyn (manager) |
| Years1: | 1982–1983 |
| Clubs1: | Błękitni Oreta |
| Years2: | 1983–1984 |
| Clubs2: | Mlexer Elbląg |
| Years3: | 1984–1986 |
| Clubs3: | Olimpia Elbląg |
| Years4: | 1986 |
| Clubs4: | Jeziorak Iława |
| Years5: | 1986–1990 |
| Clubs5: | Broń Radom |
| Years6: | 1990–1994 |
| Clubs6: | Jagiellonia Białystok |
| Caps6: | 115 |
| Goals6: | 1 |
| Years7: | 1994–1995 |
| Clubs7: | Stomil Olsztyn |
| Caps7: | 31 |
| Goals7: | 0 |
| Years8: | 1995–1998 |
| Clubs8: | Jeziorak Iława |
| Caps8: | 47 |
| Goals8: | 0 |
| Years9: | 1996 |
| Clubs9: | → Ceramika Opoczno (loan) |
| Caps9: | 28 |
| Goals9: | 1 |
| Years10: | 1998 |
| Clubs10: | Śląsk Wrocław |
| Caps10: | 8 |
| Goals10: | 0 |
| Years11: | 1998–1999 |
| Clubs11: | FF Jaro |
| Caps11: | 14 |
| Goals11: | 1 |
| Years12: | 1999 |
| Clubs12: | Świt Nowy Dwór Mazowiecki |
| Years13: | 1999–2000 |
| Clubs13: | Stomil Olsztyn |
| Caps13: | 21 |
| Goals13: | 1 |
| Years14: | 2000 |
| Clubs14: | VPS |
| Caps14: | 1 |
| Goals14: | 0 |
| Years15: | 2000 |
| Clubs15: | Siarka Tarnobrzeg |
| Caps15: | 11 |
| Goals15: | 1 |
| Years16: | 2001 |
| Clubs16: | Unia Skierniewice |
| Caps16: | 17 |
| Goals16: | 0 |
| Years17: | 2001–2002 |
| Clubs17: | Chojniczanka Chojnice |
| Caps17: | 17 |
| Goals17: | 0 |
| Years18: | 2002–2005 |
| Clubs18: | Warmia Grajewo |
| Caps18: | 63 |
| Goals18: | 2 |
| Years19: | 2005–2006 |
| Clubs19: | Mrągowia Mrągowo |
| Years20: | 2007–2008 |
| Clubs20: | Błękitni Orneta |
| Manageryears1: | 2003–2005 |
| Managerclubs1: | Warmia Grajewo (player-manager) |
| Manageryears2: | 2005–2006 |
| Managerclubs2: | Mrągowia Mrągowo (player-manager) |
| Manageryears3: | 2006–2007 |
| Managerclubs3: | Ruch Wysokie Mazowieckie |
| Manageryears4: | 2007 |
| Managerclubs4: | Błękitni Oreta |
| Manageryears5: | 2007–2008 |
| Managerclubs5: | Narew Ostrołęka |
| Manageryears6: | 2008–2009 |
| Managerclubs6: | Ruch Wysokie Mazowieckie |
| Manageryears7: | 2010 |
| Managerclubs7: | Tur Turek |
| Manageryears8: | 2010–2011 |
| Managerclubs8: | Błękitni Oreta |
| Manageryears9: | 2011–2012 |
| Managerclubs9: | Jeziorak Iława |
| Manageryears10: | 2012–2013 |
| Managerclubs10: | Tur Turek |
| Manageryears11: | 2013 |
| Managerclubs11: | ŁKS Łódź |
| Manageryears12: | 2013 |
| Managerclubs12: | Calisia Kalisz |
| Manageryears13: | 2014–2015 |
| Managerclubs13: | Drwęca Nowe Miasto Lubawskie |
| Manageryears14: | 2015 |
| Managerclubs14: | Mławianka Mława |
| Manageryears15: | 2015–2016 |
| Managerclubs15: | Olimpia Zambrów |
| Manageryears16: | 2016 |
| Managerclubs16: | Mazur Ełk |
| Manageryears17: | 2016–2017 |
| Managerclubs17: | Pelikan Łowicz |
| Manageryears18: | 2017–2018 |
| Managerclubs18: | Drwęca Nowe Miasto Lubawskie |
| Manageryears19: | 2018–2020 |
| Managerclubs19: | Stomil Olsztyn |
| Manageryears20: | 2021 |
| Managerclubs20: | Kotwica Kołobrzeg |
| Manageryears21: | 2021–2022 |
| Managerclubs21: | GKS Wikielec |
| Manageryears22: | 2024– |
| Managerclubs22: | Stomil Olsztyn |
Piotr Zajączkowski (born 8 March 1966) is a Polish professional football manager and former player who is currently in charge of III liga club Stomil Olsztyn.[1]