This landscape review aims to support MOMENTUM partners' efforts to introduce, deliver, scale up, and sustain high-quality maternal, newborn, and child health services through sound capacity measurement. The review defines the different levels and types of capacity relevant to MOMENTUM that can be measured; clarifies the distinction between capacity and performance; identifies key capacity measurement tool types and assessing their general suitability for capturing different capacities relevant to MOMENTUM; and proposes promising approaches for capacity measurement, capacity indicators, and capacity measurement tool selection that reflect the operational realities of MOMENTUM partners.