IJA may refer to:

• Imperial Japanese Army
• International Journal of Astrobiology
• International Jugglers' Association
• International Journal of Audiology
• International Juridical Association (1931–1942)

• Gold Wars
• Goldwater Republican
• Goldwater rule
• Goldwater v Carter
• Goldwater v. Ginzburg
• Goldwater Women's Tennis Classic
• Goldwater–Nichols Department of Defense Reorganization Act of 1986
• Goldwax
• Goldwax Records
• Goldwell
• Gold-whiskered barbet
• Goldwin Corlett Elgie
• Gold Win Cup Japan vs USA
• Gold window
• Goldwind Science and Technology
• Goldwin Elgie
• Goldwing Ltd Goldwing
• Goldwin Starrett
• Gold working in the Bronze Age British Isles
• Goldworm
• Goldwyn Girl
• Goldwyn Studios (disambiguation)
• Gold x award
• Goldy Goldstein
• Goldy locks and three bears