This study determined the influence of personality patterns on marital adjustments mediated by communication effectiveness for 298 international marriages in South Korea. The results are as follows: (a) The mediator effects of personality patterns and communication effectiveness on the marital adjustment of international marriages were found to be significant; in addition, a mediator path with marital adjustment as a dependent variable was verified. (b) The extroversion, agreeableness, and openness of husbands were found to have a positive effect on their communication and marital adjustment in regards to the personality patterns of international. (c) Conscientiousness was identified as the only factor that affects the marital adjustment of a wife in regards to personality patterns. The implications of this study will be discussed in the conclusion part.