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Background: Multi-visceral resection, including parts of the urinary tract, is sometimes warranted to achieve cancer clear resection margins and optimize survival in patients with locally advanced colorectal and anal cancer. The aim of this study was to assess morbidity after urinary tract reconstruction dictated by colorectal and anal malignancy and to identify potential predictors of urological complications., Methods: All patients undergoing surgery for colorectal or anal malignancy, including urinary tract resection and synchronous reconstruction, performed at the Karolinska University Hospital during 2004-2015 were included in this retrospective cohort study. Data was collected from medical records with follow-up until at least one year after the index surgery. Complications were graded according to the Clavien-Dindo classification system of surgical complications., Results: The study included 189 patients; 121 underwent cystectomy and 68 partial ureter resection. The rate of high grade urological complications was 22%. The risk of major urological complications was significantly higher in patients subjected to ureter resection compared to after cystectomy (OR 2.60, 95% CI 1.23-5.49). Also, preoperative radiotherapy and intestinal anastomotic dehiscence significantly increased the risk of high grade urological complications., Conclusion: To achieve potentially curative resections with uninvolved margins in patients with locally advanced colorectal and anal cancer, multi-visceral resection including urinary tract reconstruction can be performed with reasonable morbidity., (Copyright © 2018 Elsevier Ltd, BASO ~ The Association for Cancer Surgery, and the European Society of Surgical Oncology. All rights reserved.)