| Nikos Theodosiadis | |
| Full Name: | Nikolaos Theodosiadis |
| Birth Date: | 1973 1, df=yes |
| Birth Place: | Katerini, Greece |
| Position: | Defender |
| Currentclub: | Ethnikos Neo Keramidi (manager) |
| Years1: | 1993 |
| Clubs1: | Pierikos |
| Manageryears1: | 2012 |
| Managerclubs1: | Pierikos (caretaker) |
| Manageryears2: | 2013 |
| Managerclubs2: | Iraklis (caretaker) |
| Manageryears3: | 2013–2014 |
| Managerclubs3: | Pierikos |
| Manageryears4: | 2015–2016 |
| Managerclubs4: | Achilleas Neokesaria |
| Manageryears5: | 2016–2017 |
| Managerclubs5: | Karaiskakis |
| Manageryears6: | 2017 |
| Managerclubs6: | Pierikos |
| Manageryears7: | 2017–2018 |
| Managerclubs7: | Apollon Larissa |
| Manageryears8: | 2018 |
| Managerclubs8: | Kronos Argyrades |
| Manageryears9: | 2018–2019 |
| Managerclubs9: | Pierikos |
| Manageryears10: | 2019–2020 |
| Managerclubs10: | Kerkyra |
| Manageryears11: | 2020–2021 |
| Managerclubs11: | Koufalia |
| Manageryears12: | 2021–2022 |
| Managerclubs12: | Pierikos |
| Manageryears13: | 2022–2023 |
| Managerclubs13: | GAS Svoronos |
| Manageryears14: | 2023–2024 |
| Managerclubs14: | Pierikos |
| Manageryears15: | 2024– |
| Managerclubs15: | Ethnikos Neo Keramidi |
Nikos Theodosiadis (el|Νίκος Θεοδοσιάδης; born 14 January 1973) is a Greek professional football manager and former player.