| Ioan Constantin Marcu | |
| Fullname: | Ioan Constantin Marcu |
| Birth Date: | 1963 5, df=yes |
| Birth Place: | Oțelu Roșu, Romania |
| Position: | Midfielder |
| Height: | 1.86 m |
| Years1: | 1985–1986 |
| Clubs1: | Victoria București |
| Caps1: | 19 |
| Goals1: | 1 |
| Years2: | 1986–1990 |
| Clubs2: | Flacăra Moreni |
| Caps2: | 105 |
| Goals2: | 21 |
| Years3: | 1990–1991 |
| Clubs3: | Dinamo București |
| Caps3: | 29 |
| Goals3: | 8 |
| Years4: | 1991–1992 |
| Clubs4: | FC Brașov |
| Caps4: | 25 |
| Goals4: | 15 |
| Years5: | 1992–1995 |
| Clubs5: | Hapoel Tzafririm Holon |
| Caps5: | 71 |
| Goals5: | 29 |
| Years6: | 1994 |
| Clubs6: | → Hapoel Tel Aviv |
| Caps6: | 21 |
| Goals6: | 7 |
| Years7: | 1995–1996 |
| Clubs7: | Maccabi Netanya |
| Years8: | 1996–1997 |
| Clubs8: | FC Brașov |
| Caps8: | 15 |
| Goals8: | 1 |
| Years9: | 1997 |
| Clubs9: | Chindia Târgoviște |
| Caps9: | 2 |
| Goals9: | 0 |
| Years10: | 1998 |
| Clubs10: | CFR Caransebeș |
| Totalcaps: | 287 |
| Totalgoals: | 82 |
Ioan Constantin Marcu (born 21 May 1963) is a retired Romanian football midfielder.[1]