Because of the burden of influenza disease and the threat of influenza pandemic, a complete influenza surveillance system is needed. Surveillance data are required to guide the development of control measures. Since 2003, this surveillance has been reinforced by the French institute for public health surveillance (InVS). The French influenza surveillance includes: two sentinel surveillance schemes based on networks of general practitioners and paediatricians, surveillance of influenza hospitalization, reactive influenza mortality surveillance, surveillance of acute respiratory infection outbreaks in nursing homes for elderly people, virological surveillance and a specific surveillance for A(H5N1) cases. Influenza surveillance has also been reinforced in French territories located overseas (French territories of America, Reunion Island). Data collected with these surveillance systems are published on the InVS website (http://www.invs.sante.fr/).