The Amalthea group is made up of the small moons of Jupiter which orbit close to the planet, merging with its planetary ring. Their semi-major axes range between 128 and 222 Mm.

The four members of the group are (in order of increasing distance from Jupiter):

• Metis
• Adrastea
• Amalthea, the largest, and which gives the group its name
• Thebe