| Giacomo Valentini | |
| Birth Date: | 16 May 1911 |
| Birth Place: | Rome, Italy |
| Position: | Midfielder |
| Years1: | 1934–1935 |
| Years2: | 1935–1936 |
| Years3: | 1936–1937 |
| Years4: | 1937–1939 |
| Clubs1: | Montepaschi Roma |
| Clubs4: | M.A.T.E.R. |
| Caps2: | 6 |
| Caps3: | 25 |
| Goals2: | 1 |
| Goals3: | 5 |
Giacomo Valentini (born May 16, 1911, in Rome) was an Italian professional football player.
He played 6 games, and scored 1 goal in the Serie A 1935/36 season for A.S. Roma.