Objective: Brief Relational Therapy (BRT) includes the idea that the therapists use their in-session feelings in meta-communications about the therapy relationship to facilitate resolution of alliance ruptures. The current study aimed to explore the effect of therapist feelings on patient depressive symptoms in BRT compared to Interpersonal Psychotherapy (IPT). Methods: The effects of therapist feelings were studied in 40 patients randomized to 16 sessions of IPT or BRT, using the Feeling Word Checklist-24, the Patient Health Questionnaire-9 and the Working Alliance Inventory. Data was analyzed using dynamic structural equation modeling. Results: Negative therapist feelings predicted increase and positive feelings decrease in next-session PHQ-9 via the alliance and the patients' engaged feelings, in both treatments. The direct effect of negative therapist feelings on PHQ-9 differed significantly between BRT and IPT, with more negative feelings predicting a decrease in PHQ-9 in BRT but not in IPT. Conclusion: Negative therapist feelings may cause increase/less decrease and positive feelings more decrease in depressive symptoms via disruptions in the alliance. In BRT, if the alliance is unaffected by negative therapist feelings, the patient's depressive symptoms may improve. Findings need replication in a larger sample.