Among fall related injuries in older adults, head injuries are the most common, yet almost nothing is known about recovery from head injury, also known as traumatic brain injury or TBI, in this population. The RETRO-TBI study is a prospective cohort study of 250 adults aged 65 and older with mild TBI to evaluate recovery in cognitive, physical and psychological function and sleep quality at four timepoints (2 weeks and 3, 6, and 12 months) over the year following injury and identify factors associated with recovery trajectories. The potential impact of this work is that it will generate new knowledge that will guide targeted treatment efforts and inform future development of strategies to optimize recovery following this common fall-related injury among older adults.