A galaxy is a system of stars, stellar remnants, interstellar gas, dust, dark matter, bound together by gravity. The word is derived from the Greek galaxias, literally 'milky', a reference to the Milky Way galaxy that contains the Solar System.

Look up galaxy in Wiktionary, the free dictionary.

• List of galaxies, general list of galaxies

Galaxies by type

• List of spiral galaxies
• List of ring galaxies
• List of polar-ring galaxies
• List of quasars

Galaxies by association

• List of largest galaxies
• List of nearest galaxies
• Satellite galaxies of the Milky Way

Other characteristics

• List of galaxies named after people
• List of galaxies with richest globular cluster systems

• List of galaxy groups and clusters
• List of galaxy superclusters
• List of filaments of galaxies

Wikimedia Commons has media related to galaxies.

• Lists of astronomical objects
• List of black holes
• Lists of clusters
• List of voids
• List of the most distant astronomical objects

This article includes an astronomy-related list of lists.