Zündorf (German: Köln-Zündorf) is a suburb of Cologne, Germany and part of the district of Porz.
The former village grew from a small trading post with staple rights on the Rhine isle of Groov, which nowadays is a peninsula and popular as a local recreation area with numerous outdoor restaurants as well as a rowing and pedal boat rental station.
In the past, a river branch had been separated from the Rhine by the Groov island, also called Mittelwerth.
Prone to silting, as a consequence of the 1831 staple right abolishment, the island was connected downstream to the mainland by a dam in 1849 and broadened in 1862 by newly established groynes.
The adjacent market place is equipped with foundations for a mobile flood protection wall and had been raised in comparison to the Rhine river in 1972 and subsequently in 2006.