A Hartmann procedure was performed on 25 patients with complications of acute diverticulitis. Of the 20 patients in whom both stages were completed, 14 had a smooth course. Total hospitalization for both stages averaged 23 days. Mortality was 8%. The initial resection usually is not difficult. Subsequent reanastomosis is facilitated by an interval of at least three months between stages. The advantages of the Hartmann procedure are as follows: (1) The diseased bowel is removed at the first stage. (2) The risk of primary anastomosis is avoided. (3) Hospitalization and overall time of treatment are reduced. (4) Mortality is relatively low. The Hartmann procedure should be considered for a broader selection of patients with complications of acute diverticulitis.