Summary 1. Inguinal hernias have been found in thirty-eight infants in a group of 830 premature infants, an incidence of 4.4 per cent. 2. This incidence is similar to that reported in full-term infants. 3. The age of gestation or the birth weight of the infant were not found to be important factors, except that the smallest infants (under 1,000 grams) have developed a larger percentage of hernias than any others. 4. Males predominate in the incidence (82 per cent). 5. Fifty-eight per cent of the hernias in both sexes were right-sided, 26 per cent left-sided, and 16 per cent bilateral. 6. Increased intraabdominal tension resulting from phimosis, constipation, cough, tympanites, anal or urethral constriction, vomiting, crying, and breath holding, are important factors in the development of hernia. Immature development of the abdominal and intestinal musculature are contributory factors. 7. Treatment should be conservative. Trusses, circumcision, and meatotomy where necessary and elimination of other causes of increased intraabdominal pressure are the essential forms of therapy. 8. Strangulation is a complication calling for immediate surgical measures.