Oxygen was a gas that many species in the galaxy breathed to survive. Notable exceptions included the Kel Dors, the Gand, and the Morseerians. Planets with oxygen-rich atmospheres, referred to as "Type I atmospheres", included Naboo, Tatooine, and Coruscant, among many others.
- Ahsoka (Mentioned only)
- Rebel Rising
- A New Dawn
- Rogue One: A Star Wars Story novelization (Mentioned only)
- Star Wars: Episode IV A New Hope (First appearance)
- Battlefront II: Inferno Squad
- "Last Call at the Zero Angle"—Star Wars Insider 156 (Mentioned only)
- Doctor Aphra 5: Book I, Part V (Mentioned only)
- The Screaming Citadel, Part I (Mentioned only)
- Battlefront: Twilight Company (Mentioned only)
- Star Wars: Episode V The Empire Strikes Back
- Shattered Empire, Part II
- Aftermath: Empire's End
- "The Perfect Weapon"
- "The Face of Evil"
- Poe Dameron Annual 1
- (First identified as Oxygen)
- Star Wars: Absolutely Everything You Need to Know
- Star Wars: Rey's Survival Guide
- Star Wars: Aliens of the Galaxy
- Star Wars: Poe Dameron: Flight Log