We surveyed the composition of large and medium-sized mammals in the urban park Cinturão Verde in the city of Cianorte, Paraná, Brazil. This urban reserve is an important regional corridor for wildlife. Data were collected monthly during seven months for six days with track plots, camera traps, and visual searches for animals and sign. Richness estimates were calculated using Chao 2 and ICE estimators. Nineteen species of mammals in seven orders and 14 families were recorded. Although the area displays a high degree of disturbance, it supports the presence of important species for the fauna of northwestern Paraná, including state, regional and globally threatened species.