3A

3A, 3-A or III-A may refer to:

• 3A (Band), a German pop band
• Long March 3A, a Chinese rocket
• Northern Nevada 3A Region, a part of the Nevada Interscholastic Athletics Association governing the northern half of Nevada for high school athletics
• Route 3A (disambiguation)
• Stalag III-A, a German prisoner of war camp
• Zeolite 3A, a potassium-type molecular sieve
• Google Pixel 3a, a mid-range smartphone manufactured by Google