| Date: | 28 May – 6 June 1925 |
| Edition: | 30th / 1st |
| Location: | Saint-Cloud, France |
| Venue: | Stade Français |
| Surface: | Clay |
| Category: | Grand Slam |
| Champms: |  René Lacoste |
| Champws: | Suzanne Lenglen |
| Champmd: | Jean Borotra / René Lacoste |
| Champwd: | Suzanne Lenglen / Julie Vlasto |
The 1925 French Championships (now known as the French Open) was a tennis tournament that took place on the outdoor clay courts at the Stade Français at La Faisanderie in the Parc de Saint-Cloud in Paris, France. The tournament ran from 28 May until 6 June 1925. It was the 30th staging of the French Championships but the first time it was staged as a Grand Slam event, open to amateur players who were neither French citizens nor residents of France.[1] [2] It was the second Grand Slam tournament of the year after the Australasian Championships.
The tournament was organized by Stade Français and Racing Club de France.[3] Play on the first day was canceled due to bad weather.[4]
Suzanne Lenglen won all three events she entered; singles, doubles, and the mixed doubles and al titles were won by French players.
See main article: 1925 French Championships – Men's singles. René Lacoste defeated Jean Borotra, 7–5, 6–1, 6–4 [5]
See main article: 1925 French Championships – Women's singles. Suzanne Lenglen defeated 
Kitty McKane, 6–1, 6–2 [6]
Jean Borotra / René Lacoste defeated Henri Cochet / Jacques Brugnon, 7–5, 4–6, 6–3, 2–6, 6–3
Suzanne Lenglen / Julie Vlasto defeated Evelyn Colyer / Kitty McKane, 6–1, 9–11, 6–2
Suzanne Lenglen / Jacques Brugnon defeated Julie Vlasto / Henri Cochet, 6–2, 6–2