Grasslands are essential ecosystems that provide a multitude of services vital for environmental health and human well-being. Among these services are carbon sequestration, the support of biodiversity, water regulation, and the enhancement of soil health. This chapter explores various methodologies for evaluating and monitoring these crucial ecosystem services, emphasizing the ecological economic and social significance of grasslands. It examines a variety of assessment frameworks such as field surveys, remote sensing technologies, and ecosystem modelling, that facilitate accurate tracking of grassland health and conditions over time. Case studies from diverse regions worldwide demonstrated how comprehensive monitoring can guide sustainable management practices and inform policy decisions. These practices are essential for ensuring that grasslands continue to provide their critical services amid environmental changes and anthropogenic pressures. Ultimately, the chapter underscores the importance of adopting integrated scalable methods to enhance the resilience and long-term sustainability of grassland ecosystems globally.