Internalizing symptoms, which include anxiety and depression, may be the most common pattern of psychopathology found in children. However, the knowledge base targeting internalizing symptomology in Native American children of the Southwest is surprisingly limited. This paper reports on a study of prevalence rates of internalizing disorders among children on the Navajo Reservation. Using the Child Behavior Checklist, Youth Self-Report, and Teacher's Report Form, data were gathered from 351 Navajo children in the second and fourth grades, their teachers, and their parents or caretakers. Prevalence estimates for depression, anxiety, and somatization were higher in this group of children than in majority-population samples, and are a cause for concern among parents, teachers, and mental health agencies. Depending on the reporting source, clinically significant symptoms were found among 2.6-6.1 percent of children for depression, 2.9-5.4 percent for anxiety, and 2.6-4.2 percent for somatization. Data tables report findings by age, sex, and reporting source. Limitations of the findings are discussed along with recommendations for further research. Contains 15 references. (SV)