Marital typologies are classifications of marriages based on systematic differences among them. An assumption underlying the study of marital typologies is that within any given sample of marriages, a few discrete, meaningful types can be discerned. Marriages are categorized into types in order to understand the communication that occurs between husbands and wives (→ Interpersonal Communication; Marital Communication). Typologies of marriage range from vague, non‐theoretical formulations to elaborate conceptual models that include empirically testable statements. Researchers have adopted logical, intuitive, and empirical approaches to classify marriages to explain changing family forms over time, to help therapists working in clinical settings with troubled couples, and to aid researchers reflecting post hoc on data collected for other purposes. The resulting typologies, which focus on qualitative dimensions of relationships, have been theoretically interesting and heuristically valuable in sorting marriages.