Once Winston Churchill rightly said and I quote: “Those that fail to learn from history are doomed to repeat it.” History is not just a past to remember but history is an opportunity to explore new things and learn from it. With a great vision and mission-heart, Finnish missionaries came in the Himalayan belt in the early nineteenth century. They had a vision of entering Tibet as soon as they set foot on Indian territory. They stayed and lived difficult lives since India is riven by caste, creed, and regional backwardness, which a few of them (missionaries) correctly termed as "darkness." The Himalayan people are living considerably more comfortable lives after several decades, yet the efforts and services of Finnish missionaries are still mostly unknown among Himalayan natives. Few of numbers of published articles and books are here to describe their major contributions and chronological evidences of Finnish missionaries’ arrival to India. In this article, a thorough analysis of the socio-economic repercussions of Finnish missionaries in the Himalayan belts and Buxaduars regions of Indian states West Bengal and Sikkim was conducted using collected primary and secondary data. Therefore, this article carry out this study by collecting data (qualitative and quantitative) and information from various sources viz. Published and unpublished articles and notes, collection of primary data/information from various sources remained in India and Finland and through analysis of historical documents of Finnish Mission History.