This is a protocol for a Cochrane Review (Intervention). The objectives are as follows: To assess the safety, effectiveness and cost of incentive-based and non-incentive-based interventions for increasing blood donation. We are particularly interested in the following comparisons: Monetary versus non-monetary incentives. Monetary incentives versus non-incentive based interventions. Monetary incentives, non-monetary incentives and non-incentive-based interventions versus current practice.