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) See also Finite-state machine#Classifiers Classification (disambiguation) Classified (disambiguation)