The relationship between personality type as measured by the Myers Briggs Type Indicator (MBTI) and marital satisfaction as measured by the Marital Satisfaction Inventory (MSI) was examined in this research. Subjects were 100 volunteer couples from a southwestern urban area who were given the MBTI and the MSI. These couples were divided into three groups: 40 were in marital therapy; 30 had satisfactory marriages and had been married seven years or less; 30 also had satisfactory marriages, but had been married more than seven years. The therapy group and the satisfactorily married groups were compared as to the number of MBTI preferences held in common, the strength of these preferences and the length of time married. The extraversion-introversion (E-I) scale and the sensing-judging (S-J) temperament of the MBTI were examined by comparing the spousal combinations in each of the groups. Chi square analysis and a Pearson correlation were used. A one-way analysis of variance was run between six of the scales of the MSI and each of the four MBTI dimensions. A MANOVA was attempted on the relationship between the spousal MBTI combinations and the six MSI scales, but the population was too small for this analysis to be conclusive. There were no significant differences between the groups as far as number of preferences held in common, length of time married, and the sensing-judging temperament. There were significantly more couples in the therapy group who had differences of 40 or more points on the four MBTI scales. The extent of the difference on the sensing-intuitive (S-N) scale was found to discriminate between satisfactory and unsatisfactory marriages. Differences on the E-I scale were found to effect couples' satisfaction in the MSI scales of Time Together and Affective Communication with the combination of introvert with introvert having the most difficulty in these areas.