The term/code Z4 has several uses, including the following:

• Z4 (computer), the first computer in the world to actually be sold in 1950
• Z-4 plan, a plan that was meant to stop the Croatian War of Independence in 1994
• BMW Z4, a BMW sports car model
• Hafdasa Z-4, an Argentine submachine gun
• Sony Xperia Z4, a smartphone
• the IATA airline designator code for Zoom Airlines

• Cal State-Northridge Matadors football
• Cal State-Northridge Matadors men's basketball
• Cal State Northridge Matadors men's soccer
• Cal State Northridge Matadors men's tennis
• Cal State Northridge Matadors men's volleyball
• Cal State Northridge Matadors softball
• Cal State Northridge Matadors women's basketball
• Cal State Northridge Matadors women's soccer
• Cal State Palos Verdes
• Cal State, Palos Verdes
• Cal State-Palos Verdes
• Cal State Palos Verdes Toros
• Cal State-Palos Verdes Toros
• Cal State-Pomona
• Cal State Pomona
• Cal State, Pomona
• Cal State-Pomona Broncos
• Cal State Pomona Broncos
• Cal State-Pomona Broncos men's basketball
• Cal State Pomona Broncos men's basketball
• Cal State Rohnert Park
• Cal State, Rohnert Park
• Cal State-Rohnert Park
• Cal State-Rohnert Park Seawolves
• Cal State-Rohnert Park Seawolves football