# 1978 French Open – Mixed doubles

John McEnroe and Mary Carillo were the defending champions but both players chose not to participate.
Virginia Ruzici, the winner of the women's singles and the women's doubles titles, reached the mixed doubles final, which she lost to Pavel Složil and Renáta Tomanová when her partner Patrice Dominguez retired with an injury.

## Draw
### Key

* Q = Qualifier
* WC = Wild card
* LL = Lucky loser
* Alt = Alternate
* SE = Special exempt
* PR = Protected ranking
* ITF = ITF entry
* JE = Junior exempt
* w/o = Walkover
* r = Retired
* d = Defaulted
* SR = Special ranking

### Finals

| Semifinals | Semifinals | Semifinals | Semifinals | Final | Final |
| Paul McNamee Diane Evers | 3 | 6 | 4 | | |
| Pavel Složil Renáta Tomanová | 6 | 2 | 6 | | |
| Pavel Složil Renáta Tomanová | 6 | 2 | 6 | Pavel Složil Renáta Tomanová | 7 |
| | | | | Patrice Dominguez Virginia Ruzici | 6$^r$ |
| William Lloyd Patricia Bostrom | 3 | 6 | 5 | Patrice Dominguez Virginia Ruzici | 6$^r$ |
| Patrice Dominguez Virginia Ruzici | 6 | 3 | 7 | | |

### Top half

| First round | First round | First round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| C Lewis H Anliot | 7 | 6 | | | | | | | | | | | | |
| A Jumatano D Fiúza | 5 | 2 | C Lewis H Anliot | 6 | 6 | | | | | | | | | |
| | | | P Hagelauer M-H Thibault | 4 | 2 | | | | | | | | | |
| | | | | | | | C Lewis H Anliot | 3 | 7 | 2 | | | | |
| P McNamee D Evers | 6 | 6 | | | | | P McNamee D Evers | 6 | 6 | 6 | | | | |
| G Aubone M Voyame | 4 | 1 | P McNamee D Evers | 6 | 6 | 6 | | | | | | | | |
| A Hartmann E Rapponi | | | P Beust G Benedetti | 1 | 7 | 3 | | | | | | | | |
| P Beust G Benedetti | w/o | | | | | | | | | | P McNamee D Evers | 3 | 6 | 4 |
| | | | | | | | | | | | P Složil R Tomanová | 6 | 2 | 6 |
| | | | É Deblicker R Maršíková | 6 | 6 | | | | | | | | | |
| J Lovera L Bowrey | 6 | 7 | J Lovera L Bowrey | 1 | 3 | | | | | | | | | |
| H Roverano B Villaverde | 4 | 6 | | | | | É Deblicker R Maršíková | 2 | 4 | | | | | |
| | | | | | | | P Složil R Tomanová | 6 | 6 | | | | | |
| | | | D Naegelen R Giscafré | 1 | 1 | | | | | | | | | |
| F Dalla Fontana C Casabianca | 4 | 3 | P Složil R Tomanová | 6 | 6 | | | | | | | | | |
| P Složil R Tomanová | 6 | 6 | | | | | | | | | | | | |

### Bottom half

| First round | First round | First round | First round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| R Ycaza F Bonicelli | 7 | 7 | | | | | | | | | | | | |
| T Vázquez E Weisenberger | 5 | 5 | | R Ycaza F Bonicelli | 5 | 1 | | | | | | | | |
| W Lloyd P Bostrom | 6 | 6 | | W Lloyd P Bostrom | 7 | 6 | | | | | | | | |
| J Reyes R Darmon | 1 | 4 | | | | | W Lloyd P Bostrom | 3 | 6 | 7 | | | | |
| P Joly A-M Nasuelli | 6 | 6 | | | | | V Pecci P Teeguarden | 6 | 3 | 5 | | | | |
| J Ganzábal M Rodríguez | 4 | 3 | | P Joly A-M Nasuelli | 1 | 2 | | | | | | | | |
| | | | | V Pecci P Teeguarden | 6 | 6 | | | | | | | | |
| | | | | | | | | | | | W Lloyd P Bostrom | 3 | 6 | 5 |
| I Molina B Nagelsen | 6 | 6 | | | | | | | | | P Dominguez V Ruzici | 6 | 3 | 7 |
| D Bedel M Bureau | 2 | 3 | | I Molina B Nagelsen | 4 | 4 | | | | | | | | |
| E Bengoechea P Gomez | 3 | 4 | | Y Noah B Simon | 6 | 6 | | | | | | | | |
| Y Noah B Simon | 6 | 6 | | | | | Y Noah B Simon | 4 | 4 | | | | | |
| JL Damiani I Madruga | 4 | 7 | 6 | | | | P Dominguez V Ruzici | 6 | 6 | | | | | |
| O Laimina D Beillan | 6 | 6 | 8 | O Laimina D Beillan | 3 | 0 | | | | | | | | |
| | | | | P Dominguez V Ruzici | 6 | 6 | | | | | | | | |