The purpose of the present study was to investigate the relationship between loneliness and marital adjustment in Turkish couples. Some demographic correlates of loneliness and marital adjustment such as Sender, age, duration of the marriage, type of marriage, and degree of acquaintance before marriage were also examined. The UCLA Loneliness Scale (D. Russell, L. A. Peplau, & C. E. Cutrona, 1980) and the Dyadic Adjustment Scale (G. B. Spanier, 1976) were administered to 58 heterosexual married couples. The results showed that loneliness was significantly and negatively correlated with marital adjustment. For the demographic correlates, significant results were as follows: Self-selected marriages resulted in lower loneliness scores and higher marital adjustment scores than the arranged type of marriage, and marital adjustment increased parallel to an increase in the degree of acquaintance before marriage. The findings and implications are discussed in the context of practice and research.