The Lenuci Horseshoe or the Green Horseshoe (, ; "Lenuci" is also sometimes spelled "Lenuzzi") is a U-shaped system of city squares with parks in downtown (Donji grad) Zagreb, Croatia. The horseshoe was conceived in 1882 by Croatian urbanist Milan Lenuci. The parks were designed between 1883 and 1887, at a time when today's Donji grad formed the southern outskirts of Zagreb. The construction was helped by the efforts to rebuild the city after the 1880 Zagreb earthquake, and in 1889 the entire horseshoe was finished—its two ends were connected by the newly built Zagreb Botanical Garden. The park system consists of seven squares aligned on three straight lines.