Research has shown that patient and physician ethnic group membership affects how they engage in clinical interaction. In the US, for instance, physician's verbal and non-verbal communication differs when the patient is White or Black; therapeutic recommendations may also vary. The present study focuses on clinical relationships in psychotherapy. We propose that, even in this context, ethnicity-based differentiations can be observed, and that these disparities may depend on psychotherapist's attitudes and attributions of humanity. We employed a scenario, describing the case of a 43-year-old man (a specialized technician) suffering from panic attacks, where patient's ethnicity was experimentally manipulated, in a between-participants design. Participants were Italian students enrolled in Master's degree programs in Dynamic or Clinical Psychology, or in Specialization Schools in Psychotherapy (N = 172). They were asked to imagine being licensed professionals treating the patient: in one condition, the patient was Romanian (Alecu), in the other, he was Italian (Paolo). They answered an online questionnaire including measures of attitude and items designed to assess humanity attributions (to Alecu or Paolo). The questionnaire also included implicit and explicit measures that allowed for the detection of ethnicity-based disparities. Mediation models were tested. It was found that participants were less inclined to approach and help the Romanian patient compared to the Italian one (a SC-IAT of approach/avoidance and a SC-IAT of helping/ignoring were used as implicit measures). They provided fewer contact details to the Romanian patient and expected less adherence to treatment recommendations from him. These ethnic disparities were explained by different attitudes, but mostly by the attribution of a lower human status to the Romanian patient. Results allow for the proposal of interventions aimed at mitigating ethnic disparities in the psychotherapeutic context. The study was replicated considering the Black-White relationship (White participants). These data also will be reported.