Background. ¿ Surveillance of sexually transmitted infections (STIs) in France relies on voluntary surveillance systems. Methods. ¿ Surveillance networks of laboratory technicians and clinicians exist for gonococcal infections (Renago), urogenital chlamydial infections (Renachla), syphilis, and rectal lymphogranuloma venereum (LGV). Results. From 2000 to 2003, 1,089 cases of infectious syphilis were reported. The majority of cases were diagnosed in the Île-de-France region and primarily involved gay men. After an increase between 1997 and 2000, gonococcal infections, which remained stable from 2000 to 2002, rose again in 2003. LGV affects exclusively gay men. As of November 30, 2004, epidemiological investigations identified 123 cases of this infection, which had been virtually nonexistent until then. Urogenital chlamydial infections have been on the rise since 2001, particularly among women. Discussion. ¿ Data from voluntary surveillance underestimate the actual number of cases. They show, however, that the resurgence of STIs, as indicated by the increase in gonococcal infections, has been confirmed in recent years. The resurgence of syphilis in 2000 and the emergence of LGV in 2004 further indicate that gay men are the most affected by these infections. The trends observed in France are similar to those in many European countries. Policies to prevent these STIs, which are an additional risk factor for the spread of HIV infection, have become necessary at the European level.