The 1966 French Championships (now known as the 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 23 May until 5 June. It was the 70th staging of the French Championships, and the second Grand Slam tennis event of 1966. Tony Roche and Ann Jones won the singles titles.

Finals

Men's singles

🇦🇺 Tony Roche defeated 🇭🇺 István Gulyás 6–1, 6–4, 7–5

Women's singles

🇬🇧 Ann Jones defeated 🇺🇸 Nancy Richey 6–3, 6–1

Men's doubles

🇺🇸 Clark Graebner / 🇺🇸 Dennis Ralston defeated Ilie Năstase / Ion Țiriac 6–3, 6–3, 6–0

Women's doubles

🇦🇺 Margaret Smith / 🇦🇺 Judy Tegart defeated 🇦🇺 Jill Blackman / 🇦🇺 Fay Toyne 4–6, 6–1, 6–1

Mixed doubles

Annette Van Zyl / Frew McMillan defeated 🇬🇧 Ann Jones / 🇺🇸 Clark Graebner 1–6, 6–3, 6–2