PURPOSE: Falls in the hospital can lead to adverse events, including injuries. Studies have shown that patients with cancer and those undergoing inpatient rehabilitation (IPR) are at higher risk for falls. Therefore, we measured the frequency, degree of harm, and characteristics of patients who fell in an inpatient cancer rehabilitation unit. METHODS: A retrospective review was conducted on inpatient cancer rehabilitation patients admitted from January 2012 to February 2016. Fall frequency, degree of harm, fall circumstances, cancer type, patient's fall risk score on the basis of the MD Anderson Cancer Center Adult Inpatient Fall Risk Assessment Tool (MAIFRAT), length of stay, and risk factors were evaluated for patients. RESULTS: There were 72 out of 1,571 unique individual falls (4.6%), with a falls incidence of 3.76 falls per 1,000 patient-days. Most fallers (86%) suffered no harm. Risk factors for falls included presence of patient-controlled analgesia pump ( P = .03), pump such as insulin or wound vacuum-assisted closure ( P < .01), nasogastric, gastric, or chest tube ( P = .05), and higher MAIFRAT score ( P < .01). The fallers were younger (62 v 66; P = .04), had a longer IPR stay (13 v 9; P = .03), and had a lower Charlson comorbidity index (6 v 8; P < .01). CONCLUSION: The frequency and degree of harm for falls in the IPR unit were less than previous studies, which suggests that mobilization for these patients with cancer is safe. The presence of certain medical devices may contribute to fall risk, and more research is needed to better prevent falls in this higher-risk subgroup.