Intestinal stoma site marking has been systematically carried out in surgical units in Coloproctology, at the Hospital University of Ribeirão Preto at University of São Paulo, São Paulo/Brazil, which requires clinical experience and expertise to perform the procedure due to the clinical complexity of patients. Aimed to evaluate the stoma site marking of preoperative stoma in four patients (adults and seniors) with the possibility of intestinal stomas. A prospective case study of 4 patients (2 women and 2 men) with intestinal diseases (colorectal cancer and inflammatory disease) who received preoperative teaching and were marked; whose assessment of clinical evolution and stoma site marking occurred on the 3rd. day after surgery, with document and photographic record. As results, preoperatively, patients were informed about the proposed surgery and the possibility of ostomy by the surgical and nursing staff; was performed retrograde colonic enema with the patients, bilateral stoma site marking, preoperative teaching on surgery and its consequences, as well as informed about follow-up and referral to Ostomy Program. Three patients required ileostomy (n=1) and colostomy (n=2), the ostomy corresponded to its previous stoma site marking, which allowed the application and handling of the collection bag without difficulty to move the patient (sitting, standing or lying) with and without the help of professionals; absence of complications effluent overflow of peristoma stoma or the skin; patients had elimination of flatus and semi-liquid stool; could perform the emptying of the effluent in the 2nd. and 3rd. days after surgery and reported being encouraged to learn self-care and have confidence in their postoperative recovery. The stomas were made properly for placing and manipulation of equipment. The stoma site marking of intestinal stoma and preoperative education have provided security and confidence to the patient in the perioperative period and absence of complications of stoma and skin peristoma