Over a quarter of a million falls are reported by the UK hospitals each year, predominantly harming older patients whose vulnerability to falling arises from a complex interaction of risk factors, including impaired mobility, dementia, delirium, medication and the effects of long term and acute illness. Systematic review of research trials indicates that multifactorial assessment and intervention to treat, modify or better manage these underlying risk factors can reduce falls by 20 -30%. However, the evidence base is not always reflected in hospitals' falls prevention policies, and is not consistently delivered to patients. The organizational culture and processes that can increase the effective delivery of evidence-based falls prevention are discussed, alongside learning from quality improvement projects. Systematic learning from reported falls and essential care after an inpatient fall are also explored.The scale of the challenge Falls are defined as "an unexpected event in which the participant comes to rest on the ground, floor, or lower level" 1 -a definition that in the hospital setting encompasses slips, trip, faints, collapses and patients who are found on the floor. 2 Falls are the most commonly reported patient safety incident in almost all acute and community hospitals and mental health units, with over 280 000 falls reported in England and Wales each year 3 and over a thousand falls per year reported from an acute hospital of average size. 2 Falls predominantly affect and harm older, frailer people; over 80% of falls in hospital occur in patients aged over 65 years, with the highest falls rates and the greatest vulnerability to injury seen in patients aged over 85 years. 2 Falls can have serious consequences; 30% of falls in hospitals result in some injury, and almost 2000 fractures are reported annually. 3 People who are hospital patients when they fall and fracture have poor outcomes and greatly extended lengths of stay and for some, the "final straw" of a serious injury on top of their pre-existing long term and acute illnesses will prove fatal. 4 Inquests into the deaths of patients who have fallen in hospital frequently indicate a catalogue of missed opportunities to prevent the fall (Box 1).Not all falls have such serious consequences, but even falls with minor or no injury can cause anxiety and distress to patients and their families, and create a downward spiral where the fear of falling leads to reduced mobility, increased dependency and an extended length of stay, or triggers a move to a care home. 4 Although successful litigation cases related to hospital falls are relatively rare (less than 30 per year in England) and the financial settlements are usually low (averaging around £13 000), 5 the considerable potential for harm to patients and to the hospital's reputation make the prevention of falls an important patient safety challenge for clinical and managerial staff.