Westralia is a common contraction of Western Australia. Specific uses include:

• The term was used by secessionists during the campaigns involved with Secessionism in Western Australia
• HMAS Westralia, the name of two ships to serve in the Royal Australian Navy
  • HMAS Westralia (1939), an armed merchant cruiser and later, infantry landing ship, operated during World War II
  • HMAS Westralia (O 195), a replenishment tanker operated between 1989 and 2006
• SS Westralia (1896), a passenger liner converted into a troopship and sunk in 1942
• Westralia Airports Corporation - the company that operates Perth Airport, Western Australia.