This surveillance report describes influenza data and analyses from October 2011 to May 2012. Data were received from all EU Member States, Iceland and Norway. It concludes that the influenza season 2011/12 started late and there was no particular pattern in its geographical progression. Its intensity was mild and unusually low in the majority of countries. Elderly and infants aged 0–4 years were the most severely affected groups of patients. With the return of A(H3N2) virus, a shift to older ages in severe influenza cases was observed.