This article outlines the concept of “joint marital personality” as first described by Henry Dicks in 1967, an idea that through continuous cycles of mutual projective identification, each member of the couple locates parts of the self in the partner either because these are rejected inside the self and so located in the other, or because wished-for attributes are felt to be missing in the self and are sought in the other. The article then describes the process of establishing a joint marital personality that is the resulting characteristic style of the couple, but not of either individual alone, and finally discusses the application of this concept to clinical situations with couples.