IA4 may refer to:

• Iowa's 4th congressional district
• Iowa Highway 4
• an unofficial backronym for Intel's 4-bit processor architecture
• Continental Drift, also known as Ice Age 4.

• Vitebskaya oblast'
• Vitebsk District
• Vitebsk district
• Vitebsk Ghetto
• Vitebskiy Kurier
• Vitebsk Museum of Modern Art
• Vitebsk-Orsha Offensive
• Vitebsk-Orsha Offensive Operation
• Vitebsk Province (disambiguation)
• Vitebsk raion
• Vitebsk regional museum
• Vitebsk State Technological University
• Vitebsk State University
• Vitebsk Strangler
• Vitebsk–Orsha Offensive
• Vitebsk–Orsha Offensive Operation
• VI Technology
• Vite de' piu eccellenti architetti, pittori, et scultori Italiani
• Vite de' piu eccellenti pittori, scultori, ed architettori
• Vitejeves
• Vitejovice
• Vitekorchis callistum
• Vitekorchis excavata
• Vitekorchis foveatus
• VITELCO