Classifier

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)