AJB may refer to:

• The Amazing Jeckel Brothers, an album by Insane Clown Posse
• The Amazing Joy Buzzards
• American Journal of Botany
• American Journal of Business

• Alan M. Olson
• Alan Montgomery
• Alan Moody
• Alan Mootnick
• Alan Morgan (footballer born 1973)
• Alan Morgan (footballer born 1983)
• Alan Morris
• Alan Morris (character)
• Alan Morris (disambiguation)
• Alan Morton (disambiguation)
• Alan Morton (footballer born 1942)
• Alan Morton (footballer born 1950)
• Alan Morton (footballer, born 1950)
• Alan Moses
• Alan Mountain Limestone
• Alan M. Roberts
• Alan M. Rugman
• Alan M. Sargeson
• Alan M. Taylor
• Alan Muir (footballer)
• Alan Muir (referee)
• Alan Mulgan
• Alan Mulholland
• Alan Murchison
• Alan Murdoch-Cozens