AbstractAlthough the costs of fish-related mitigation measures can play an important role in the adoption of mitigation measures, there is relatively little information about this aspect. This chapter presents an overview of the range of costs for different mitigation measures and compares their magnitudes. As many mitigation measures are adopted in combination, one of the challenges related to cost analysis is the lack of disaggregated cost data. Thus, this chapter also reviews costs of adopting combined mitigation measures such as morphological changes and environmental flow. In turn, case studies demonstrate how to compare costs if multiple types of mitigation measures are adopted.