• Chemical classification
• Taxonomy, the practice and science of categorization

Biology

• Biological classification
• Alpha taxonomy, the science of finding, describing and naming organisms
• Linnaean taxonomy, the classic scientific classification system
• Cladistics, a new way of classifying organisms, based solely on phylogeny
• Virus classification, naming and placing viruses

Astronomy

• Stellar classification
• Galaxy morphological classification

See also

• Classification fuck u , general
• Systematic name