In linguistics, word order typology refers to the study of the order of the syntactic constituents of a language, and how different languages can employ different orders. Correlations between orders found in different syntactic subdomains are also of interest. The primary word orders that are of interest are the constituent order of a clause—the relative order of subject, object, and verb; the order of modifiers (adjectives, numerals, demonstratives, possessives, and adjuncts) in a noun phrase; and the order of adverbials.

Some languages have relatively restrictive word orders, often relying on the order of constituents to convey important grammatical information. Others, often those that convey grammatical information through inflection, allow more flexibility which can be used to encode pragmatic information such as topicalisation or focus. Most languages however have some preferred word order which is used most frequently.

For most nominative–accusative languages which have a major word class of nouns and clauses which include subject and object, constituent word order is commonly defined in terms of the finite verb (V) and its arguments, the subject (S) and object (O).