Öjendorfer Park, Public park and heritage monument in Billstedt, Hamburg, Germany.

Öjendorfer Park is a green space with a large lake in eastern Hamburg situated between two motorways. The water body is surrounded by forest strips and wide open areas that create different environments within the park.

A sand pit operated here from 1925 to 1929, reaching depths of up to 12 metres. Between 1950 and 1953, around 25 million tonnes of rubble from Hamburg's destroyed eastern districts were dumped into it. In 1954 the remaining hollow was filled with water from the Schleemer Bach, and from 1958 the surrounding park landscape was shaped and planted, reaching its final form in 1968.

The park serves as a recreational retreat where locals walk, cycle, and spend time by the water. The varied zones from playgrounds to open green areas allow different activities to coexist in the same space.

The lake is open for swimming during summer months, with a northern section reserved for birds and wildlife. The pathways throughout the park are wide and accommodate different types of movement, making it accessible to most visitors.

The lake was created in 1954 when the remaining parts of the sand pit were filled with water from the Schleemer Bach. From 1957 to 1966 a rubble-processing plant on the site supplied crushed stone to the construction industry. The park only reached its final form in 1968.