Classifier may refer to:

• Classifier (linguistics), or measure word, especially in East Asian languages
  • Classifier handshape, in sign languages
• Classifier (UML), in software engineering
• Classification rule, in statistical classification, e.g.:
  • Hierarchical classifier
  • Linear classifier
• Deductive classifier
• Subobject classifier, in category theory
• An air classifier or similar machine for sorting materials
• Classifier (machine learning)

• Finite-state machine#Classifiers
• Search for all Wikipedia articles containing "classifiers"
• Classification (disambiguation)
• Classified (disambiguation)