Ostermannbrunnen, Fountain in Altstadt-Nord, Cologne, Germany.

Ostermannbrunnen is a fountain on Ostermannplatz in Cologne's Altstadt-Nord, built in 1938 from shell limestone. Fifteen carved figures stand around a triangular basin with water jets. Sculptor Willy Klein modeled them on characters from songs by Willi Ostermann, the Cologne songwriter the fountain commemorates.

The Ostermannbrunnen was inaugurated on February 16, 1939, on Ostermannplatz as a memorial to Willi Ostermann, the Cologne songwriter who died in 1936. The sculptor Willy Klein created the fifteen figures around the triangular basin. The fountain was built after Ostermann's folk songs had shaped the city's carnival traditions.

The fifteen figures around the basin depict characters from Willi Ostermann's songs, such as the 'Neugierige Frösch' and the 'Stiefel' from 'Wenn et Trömmelche jeht'. These song characters remain familiar to Cologne carnival-goers, who still sing the songs during the session. The fountain keeps this repertoire visible in the old town outside carnival time.

Ostermannbrunnen stands on Ostermannplatz in Cologne's Altstadt-Nord, a short walk from the Hauptbahnhof and served by nearby tram and bus stops. The square is open at all hours and entry is free. The Willi Ostermann Society looks after the fountain's upkeep.

Every November 11th, the fountain serves as the ceremonial starting point for the carnival season when local carnival societies gather with their flags. The traditional song 'Heimweh nach Kölle' is performed by children's choirs during this opening ceremony.