Glaciers play a critical role in supporting ecosystems and human communities, particularly in mountainous regions & downstream areas in Himalayas, Alps, Andes and other mountain ranges worldwide. These ice reservoirs provide a broad spectrum of glacier ecosystem services (GES) such as water supply for irrigation, hydropower generation, domestic use, streamflow regulation, spirituality & aesthetic values. Glacier meltwater forms a key component on the water and sustains ecosystem functions and requirements of local communities directly or indirectly. Ubiquitously observed glacier mass loss due to warming climatic conditions have already been observed to disrupt these essential services. Therefore, this study aims to systematically analyze the contribution of glaciers and glacier meltwater in supporting water and energy and food security using qualitative methods, GIS and modelling techniques. We present the conceptual framework of quantifying GES using ecosystem services framework and multi-decision-making techniques embedded in GIS and showcase a case study in dry and arid and heavily glacierized Lahaul Valley in Western Himalayas. The study will present the first of its kind analysis of the various ecosystem services supported by glaciers, which will aid in creating a better resource and knowledge base in other glacier-dependent regions and will aid in glacier related adaptation strategies that may be planned in the future.