Social participation is a concept which has been minimally studied in the field of mental health. This paper aims at comparing the social participation of 24 people with a psychotic disorder, 22 people with a mood or anxiety disorder and 28 people with a cluster B personality disorder with acute or subacute phases. The Assessment of Life habits (short version 3.1) was used to measure their social participation. It contains 77 life habits distributed in six domains of daily activities and six domains of social roles. The analysis showed that the three groups experience the same quality of social participation. The people with a mood or anxiety disorder were however more dissatisfied than the people with a psychotic disorder (p = 0,01). The domain of the personal care proved to be more easily accomplished and most satisfactory for the three groups. The domain of recreational activities appeared the most difficult to accomplish for the people with a mood or anxiety disorder and those with a cluster B personality disorder. The education and work domains showed difficulties for the group with psychotic disorders. The persons with a mood or anxiety disorder consider that the activities linked with the body condition are those accomplished with the most dissatisfaction. For the persons with a cluster B personality disorder, the interpersonal relationships represent the most dissatisfaction and for the persons with a psychotic disorder, work and education are the most dissatisfying.