Nagykörút or Grand Boulevard (sometimes Great Boulevard, lit. “Big Ring Road”) is one of the most central and busiest parts of Budapest, a major thoroughfare built by 1896, Hungary’s Millennium. It forms a semicircle connecting two bridges of the Danube, Margaret Bridge on the north and Petőfi Bridge on the south. Usually the part inside and around this semicircle is counted as the city centre of Budapest (see Belváros).

Nagykörút is actually a colloquial name of its five parts which connect to each other: (from north to south) Szent István körút, Teréz körút, Erzsébet körút, József körút and Ferenc körút; these are the names the traveller will find on the map and the buildings. Nagykörút is usually meant to include its Pest part (i.e., the east side of the Danube), but it might be applied to its extension on the Buda side as well (in this latter sense, Margit körút will be its sixth part).