Order may refer to:

Honors

• Order (decoration), medal or award

Religious, chivalric, fraternal, and ideological

• Chivalric order, established since the 14th century
• Fraternal order
• Holy Orders, the rite or sacrament in which clergy are ordained
• Military order, established in the crusades
• Monastic order, established since circa 300 AD
• Religious order
• Order (organization), an organization of people united by a common fraternal bond or social aim
• Tariqa or Sufi Order
• A Cardassian military unit in the fictional Star Trek universe
• An Order of the Mishnah, the name given to a sub-division of the Mishnah, a major religious text
• The Order of the Mass is the set of texts of the Roman Catholic Church Latin Rite Mass that are generally invariable.
• The Order (group), an underground American neo-Nazi organization active in 1983 and 1984.

Legal, political, and military

• Court order, made by a judge; a restraining order, for example, is a type of injunction
• Executive order, issued by the executive branch of government
• General order, a published directive from a commander
• Law and order (politics)
• Social order, referring to the conduct of society
• Standing order, a general order of indefinite duration, and similar ongoing rules in a parliament
• World order, including the concept of a world government

In economics and commerce

• Money order
• Order (business), an instruction from a customer to buy
• Order (exchange), customer's instruction to a stock broker
• Order of degrees in the Elliott wave principle

In science

• Order (biology), a rank between class and family, or a taxon at that rank
• Order of reaction, a concept of chemical kinetics
• Order (crystal lattice) an arrangement of composition, spin, magnetism, etc. in a crystal lattice.
• Order of hierarchical complexity, the ordinal complexity of tasks that are addressed
• Social order, a concept used in sociology, history and other social sciences
• Topological order, an organized quantum state
• An order parameter in physics has value 1 for complete order and value 0 for complete disorder
• The contrary of chaos, disorder (in the sense of randomness), or entropy
• A way of categorizing the size of lighthouse Fresnel lenses
• A geologic term for classifying tributaries

In mathematics

for: Order (mathematics)

Order is applicable to a large number of concepts in mathematics, especially in algebra, arithmetic, analysis, combinatorics, fractals, graphs and mathematical theories.

In computer science

• Computational complexity theory, aka order of computation, describes complexity or scalability in computational complexity theory and Big O notation
• Order (information processing), a measure of the number of objects or sub-systems in a system
• Ordered activities in metamodeling
• Order by clause in SQL
• Ordered or unordered data in data synchronization
• Ordered list is an HTML element
• Canonical order, the order of elements that obeys a certain set of rules or specifications
• Z-order on computer screens