Place Eugène Flagey (in French: Place Eugène Flagey, in Dutch: Flageyplein, usually shortened to Flagey by locals), is a square in the Brussels municipality of Ixelles, Belgium. It was named in honour of Eugène Flagey, mayor of Ixelles from 1935 to 1953. With ten streets converging at Flagey Square, it is one of the best connected crossroads in the city, directly adjacent to the neighbouring Ixelles Ponds (the street separating them now will disappear). A large flood control reservoir (necessary due to the low-lying terrain and high groundwater level) and a parking lot have been built under the square.