Over the past decades, informal enterprising activitiesInformal enterprising activities have been an important sector towards urban sustainabilityUrban sustainability in Kathmandu valley, Nepal. Informal marketingInformal marketing is a traditionalTraditional system and has been operating in the valley for a long. Other informal activities including urban wasteUrban wastes management for recycling and reuse recently emerged in the valley. The contribution of these informal activities towards urban sustainabilityUrban sustainability in the valley is discussed in terms of employmentEmployment generation and income among the poor, migrants, and womenWomen, which they take on to meet their basic needs (food, health, children's educationEducation, amenitiesAmenities, etc.) and environmental conservationEnvironmental conservation. These informal activities show unique features in terms of marketing, spatial locationSpatial location, and transformation. Policy measures are also provided for better managing of the informal marketplacesMarketplace and marketing systems, and environmental conservationEnvironmental conservation towards urban sustainabilityUrban sustainability in Kathmandu valley.