Blue Mountains may refer to:

• Blue Mountains (New South Wales), Australia
  • City of Blue Mountains, a local government area west of Sydney
  • Blue Mountains Conservation Society, NGO advocating for the protection of the Blue Mountains in NSW
  • Blue Mountains Line, a railway line
  • Blue Mountains National Park
  • Blue Mountains walking tracks
  • Electoral district of Blue Mountains
  • Greater Blue Mountains Area, a World Heritage Site
• Blue Mountains (Nunavut), Canada
• The Blue Mountains, Ontario, a town in Canada
• Blue Mountains (Congo), northwest of Lake Albert, Democratic Republic of the Congo
• Sinimäed Hills (Blue Mountains) in Estonia, near Narva
• Nilgiri mountains (Blue Mountains), southern India
• Blue Mountains (Jamaica)
• Blue Mountains (New Zealand), in West Otago
• Blue Mountains (Niger), a mountain range near the Aïr Mountains in Niger
• Blue Mountains (Pacific Northwest), United States
  • Blue Mountains (ecoregion), a Level III ecoregion
• Blue Mountains or Abajo Mountains, Utah, United States

• The Blue Mountains (Elgar), a song about Australia by Sir Edward Elgar to a poem by Alfred Noyes
• The Blue Mountains (fairy tale), a fairy tale by Andrew Lang in The Yellow Fairy Book
• Blue Mountains (Middle-earth) or Ered Luin, fictional mountains in Tolkien's Middle-earth

• Blue Mountains (1983 film), Georgian film of Eldar Shengelaia
• Blue Mountains (2015 film), Hindi film of Raujesh Kumar Jain
• "Blue Mountains" (Bluey), an episode of the first season of the animated TV series Bluey

• List of Blue Mountains subjects, articles about the Blue Mountains in Australia
• Blue Mountain (disambiguation)
• Blue Ridge Mountains
• Blue Ridge (disambiguation)