In the Original Investigation titled “Effect of Multimodal Prehabilitation vs Postoperative Rehabilitation on 30-Day Postoperative Complications for Frail Patients Undergoing Resection of Colorectal Cancer: A Randomized Clinical Trial,”1 published online January 22, 2020, a correction was made to fix the affiliation for Drs Liberman, Stein, Charlebois, and Fiore, which had been given as the Department of Anesthesia, Montreal General Hospital McGill University Health Center; these authors are affiliated with the Department of Surgery. This article was corrected online.