Investigated the incidence of schizophrenia (SZ) in some immigrant groups residing in the Netherlands, the treated point prevalence at outpatient mental health services, and schizophrenics' previous hospital admissions. 4,758 outpatients (aged 20-64 yrs) who were treated previously for non-affective psychosis were assessed for sociodemographic and clinical characteristics. Results show that 713 Ss were diagnosed with SZ. The prevalence of SZ in male immigrants from Surinam and Morocco and in female immigrants from Surinam, the Netherlands Antilles, and Cape Verde was significantly higher than that in the native-born Ss, but the prevalence was not significantly higher in immigrants from Turkey, female immigrants from Morocco, or male immigrants from the Antilles. Proportions of Ss with a previous hospital admission were similar in each ethnic group. It is concluded that there is an increased incidence of SZ in some immigrant groups residing in the Netherlands.