Order in mathematics may refer to:
In logic, model theory and type theory:
- Order (journal), an academic journal on order theory
- Dense order, a total order wherein between any unequal pair of elements there is always an intervening element in the order
- Glossary of order theory
- Lexicographical order, an ordering method on sequences analogous to alphabetical order on words
- List of order topics, list of order theory topics
- Order theory, study of various binary relations known as orders
- Order topology, a topology of total order for totally ordered sets
- Ordinal numbers, numbers assigned to sets based on their set-theoretic order
- Partial order, often called just "order" in order theory texts, a transitive antisymmetric relation
- Total order, a partial order that is also total, in that either the relation or its inverse holds between any unequal elements
- Order statistics
- First-order statistics, e.g., arithmetic mean, median, quantiles
- Second-order statistics, e.g., correlation, power spectrum, variance
- Higher-order statistics, e.g., bispectrum, kurtosis, skewness