| Marios Nicolaou | |
| Birth Date: | 4 October 1983 |
| Birth Place: | Limassol, Cyprus |
| Position: | Defensive Midfielder |
| Years1: | 1998–2002 |
| Clubs1: | Aris Limassol |
| Caps1: | 59 |
| Goals1: | 8 |
| Years2: | 2002–2004 |
| Clubs2: | AC Omonia |
| Caps2: | 8 |
| Goals2: | 0 |
| Years3: | 2004–2007 |
| Clubs3: | Aris Limassol |
| Caps3: | 62 |
| Goals3: | 10 |
| Years4: | 2007–2010 |
| Caps4: | 71 |
| Goals4: | 1 |
| Years5: | 2010–2015 |
| Clubs5: | AEL Limassol |
| Caps5: | 129 |
| Goals5: | 6 |
| Years6: | 2015–2016 |
| Caps6: | 15 |
| Goals6: | 0 |
| Years7: | 2016 |
| Caps7: | 7 |
| Goals7: | 0 |
| Years8: | 2016–2018 |
| Clubs8: | AEL Limassol |
| Caps8: | 43 |
| Goals8: | 1 |
| Nationalyears1: | 2003–2017 |
| Nationalteam1: | Cyprus |
| Nationalcaps1: | 54 |
| Nationalgoals1: | 0 |
Marios Nicolaou (; born 4 October 1983) is a retired Cypriot footballer and is currently an assistant coach for AC Omonoia.