Möckeln[a] is a lake in Karlskoga and Degerfors Municipalities in Örebro County, Sweden.

Species of Zander (Sander lucioperca), European perch (Perca fluviatilis) and Northern pike (Esox lucius) are most frequently fished here.

Geological surveys in 2011 led by the geophysicist Herbert Henkel, formerly active at the Royal Institute of Technology, established that Möckeln lake northern end towards Karlskoga is a degraded meteorite impact crater with an original diameter of about 4.5 km.

The crater has been deformed somewhat by the excess of a heavy rocks at the east of the lake and it is also affected by erosion.

Other examples of known impact craters in Sweden are Siljan Ring, Dellen and Mien.