In this paper, we review the empirical publications from the 1990s on the assessment of object relations (OR). Twelve different measures are referenced. Major findings of studies, conclusions, and evaluations of each measure are provided. In general, it was found that the most recent empirical literature has compared OR across diagnostic groups or evaluated therapy process and outcome by the quality of one's OR. Current strengths and limitations of the extant OR literature are provided, along with methodological recommendations to expand the utility and validity of OR assessment.