Galaxy

A galaxy was a massive collection of stars, planets and other celestial objects residing within the universe. One known galaxy was the galaxy home to the Galactic Republic and the Galactic Empire, also notable for containing the Wellspring of Life which gave birth to the midi-chlorians.

Taka Jamoreesa, when advertising themself as a pilot was said to be 'wanted' in 18 galaxies.

Appearances
Galaxies, specifically the galaxy, appear in literally every single piece of Star Wars media. This list only includes specific mentions, descriptions, hologram appearances, and outside views of galaxies.

Non-canon appearances

 * Star Wars Epic Yarns: The Empire Strikes Back