The Jellyfish Nebula  (AKA: IC 443 and Sh2-248) is a galactic supernova remnant in the constellation Gemini. On the plane of the sky, it is located near the star Eta Geminorum.

Its distance is roughly 5,000 light years from Earth.

This nebula may be the remains of a supernova that occurred 30,000 - 35,000 years ago. The same supernova event likely created the neutron star CXOU J061705.3+222127, the collapsed remnant of the stellar core. The Jellyfish Nebula is one of the best-studied cases of supernova remnants interacting with surrounding molecular clouds.

In the southeast the blast wave is interacting with a very dense and clumpy molecular cloud, such that the emitting shocked gas has a ring-like shape. The blast wave has been strongly decelerated by the cloud and is moving with an estimated velocity of roughly 30–40 km/sec.