&NA;The operation of horizontal and longitudinal colomyotomy for diverticular disease is described and satisfactory short‐term results in six patients are presented. The indications and reasons for the use of this procedure are discussed. It is suggested that the operation is a satisfactory treatment, without the risks associated with division of all the circular muscle fibers, or with resection and anastomosis. The necessity for long‐term high dietary fiber intake is stressed.