The aim of the study was to compare the effectiveness of acceptance and commitment-based couple therapy and cognitive-behavioral couple therapy on the quality of relationships and trust in couples with emotional divorce who referred to counseling centers in Ahvaz in 2014-2015. The present study design was a semi-experimental study that was conducted with two experimental groups (acceptance and commitment-based couple therapy and cognitive-behavioral couple therapy) and a control group in three stages: pre-test, post-test, and follow-up. Among the couples involved in emotional divorce, 45 people were included in this study with an alpha of 0.05, statistical power of 0.8, and a presumed effect size of 0.7. The analysis of covariance method was calculated using the POWER*G software. The sample size for each group was 15 people. They were selected purposively and randomly placed in three groups (15 couples in each group). The control group did not receive any of the interventions. The acceptance and commitment therapy group underwent 12 90-minute sessions of this intervention. The cognitive-behavioral therapy group underwent 12 90-minute sessions of this intervention. In order to collect data, the Busby et al. (1995) Marital Quality Questionnaire and the Rempel and Holmes (1985) Trust in Interpersonal Relationships Questionnaire were used. The data were analyzed using analysis of covariance and analysis of variance with repeated measures in SPSS 31 software. The research findings showed that both methods of couple therapy increased the quality of relationships and trust in couples and were effective in the post-test and follow-up stages (P<0.001).