The present book deals with impact of migration in mountain with particular reference to Uttarakhand Mountain which is popularly known as abode of resources. However, in spite of resource abundance, the people of Uttarakhand Mountain region are still economically weak. Agriculture and allied activities being the main occupations engages nearly 80 percent of the total workforce. Agriculture is unable to fulfil the needs of people as it is subsistence in nature and its productivity is also low. The region is also lagging in secondary, tertiary and quaternary activities. Therefore, poor economic conditions of the region force the people to migrate outside the area in search of jobs for better livelihoods and standard of living. They mostly join the military, para military services or settle down mainly in urban centres of North India. The outmigration mainly of youth male has become a common phenomenon since 1900 A.D. With the passage of time, outmigration process has brought numerous changes in socio-economic conditions of the region such as changes in cropping pattern, improved literacy rate, social status and standard of living but notable is the increased workload on women in the absence of male members of the family. Since last few year returned/reverse migrations has also brought many changes.