Occupational therapy (OT) services have been provided for people with mental health conditions since the foundation of the profession, but OT practices are not clearly outlined. This paper presents the standard OT practices performed in the mental health area. The aim of the study is to quantitatively characterize domains of OT intervention in mental health. Specifically, OT intervention in community and inpatient-based mental health settings is described, further delineated by age groups and gender. Eighteen occupational therapists (OTs), who work in the area of mental health, participated in the study. Each OT had at least two years of experience, was between the ages of 26 and 40, and documented 2-4 treatment sessions. In total, 70 treatment sessions were recorded; half were recorded in hospitals and the majority of recorded sessions involved clients diagnosed with schizophrenia (n = 47). Significant differences were found in the intervention provided in the different settings. In addition, the intervention focus for men and women, and for age groups, was different. Despite these differences, many aspects of the intervention were similar in all contexts. The study results support previous notions that context influences intervention.