The 1978 French Open was a tennis tournament that took place on the outdoor clay courts at the Stade Roland Garros in Paris, France. The tournament ran from 29 May until 11 June. It was the 82nd staging of the French Open, and the first Grand Slam tennis event of 1978.

Finals

Men's singles

🇸🇪 Björn Borg defeated 🇦🇷 Guillermo Vilas, 6–1, 6–1, 6–3

Women's singles

🇷🇴 Virginia Ruzici defeated Mima Jaušovec, 6–2, 6–2

Men's doubles

🇺🇸 Gene Mayer / 🇺🇸 Hank Pfister defeated 🇪🇸 José Higueras / 🇪🇸 Manuel Orantes, 6–3, 6–2, 6–2

Women's doubles

Mima Jaušovec / 🇷🇴 Virginia Ruzici defeated 🇦🇺 Lesley Turner Bowrey / 🇫🇷 Gail Sherriff Lovera, 5–7, 6–4, 8–6

Mixed doubles

Renáta Tomanová / Pavel Složil defeated 🇷🇴 Virginia Ruzici / 🇫🇷 Patrice Dominguez, 7–6, retired

Prize money

Total prize money for the event was FF2,035,764.