| Idilio Cei | |
| Birth Date: | 8 August 1937 |
| Death Place: | Larciano, Italy |
| Position: | Goalkeeper |
| Years1: | 1956–1958 |
| Caps1: | ? |
| Goals1: | ? |
| Years2: | 1958–1968 |
| Caps2: | 268 |
| Goals2: | 0 |
| Years3: | 1968–1970 |
| Caps3: | ?17 |
| Goals3: | 0 |
| Years4: | 1970–1972 |
| Caps4: | 46 |
| Goals4: | 0 |
| Years5: | ?–? |
| Caps5: | ? |
| Goals5: | ? |
| Manageryears1: | ?–? |
| Managerclubs1: | Larcianese |
| Manageryears2: | 1979–1980 |
| Managerclubs2: | Siena |
| Manageryears3: | 1980–1981 |
| Managerclubs3: | Sangiovannese |
| Manageryears4: | 1981–1982 |
| Managerclubs4: | Livorno |
| Manageryears5: | 1984–1985 |
| Managerclubs5: | Massese |
Idilio Cei (born August 8, 1937, Monsummano Terme – d. March 24, 1996) was an Italian football goalkeeper.