The Sample Study on Avifaunal Diversity of North Sikkim was conducted by Lina Chatterjee in the month of October 2018 and the identification and data analysis was done by Nature Mates-Nature Club team. This dataset covers the areas Lachen, Yamthung valley, Lachung, Gurudongmar. The study area covers varied habitats like Alpine pasture, hilly area, waterfalls, meandering rivers, rhododendron forest, River, hot spring, grazing pasture, rolling meadows with pine and silver fir lining sides, Cold alpine lake, snow capped mountain. All the species are identified up to the species level. A total of 108 species of birds are recorded belonging to 36 families, 9 orders. Sampling method: Pont Count Contacts 1.Name: Arjan Basu Roy Position: Secretary Organization: Nature Mates-Nature Club Address: 6/7 Bijoygarh Kolkata-700032 Email: basuroyarjan@gmail.com Orcid : https://orcid.org/0000-0001-9872-3562 2.Name: Lina Chatterjee Position: Research Associate Organization: Nature Mates-Nature Club Address: 6/7 Bijoygarh Kolkata-700032 Email: lina.linachatterjee@gmail.com Orcid : https://orcid.org/0000-0002-5626-5046 3.Name: Tarak Samanta Position: Research Associate Organization: Nature Mates-Nature Club Address: 6/7 Bijoygarh Kolkata-700032 Email: taraksamanta995@gmail.com Orcid : https://orcid.org/0000-0001-6809-0549 4.Name: Sumana Besra Position: Intern Organization: Nature Mates-Nature Club Address: 6/7 Bijoygarh Kolkata-700032 Email:sumanabesra1999@gmail.com Orcid : https://orcid.org/0000-0001-7222-2946 5.Name: Nivedita Sengupta Position: Research Associate Organization: Nature Mates-Nature Club Address: 6/7 Bijoygarh Kolkata-700032 Email: niveditasngpta.ns@gmail.com Orcid : https://orcid.org/0000-0003-1085-7385 6.Name: Vijay Barve Position: Research Advisor Organization: Nature Mates-Nature Club Address: 6/7 Bijoygarh Kolkata-700032 Email: vijay.barve@gmail.com Orcid : https://orcid.org/0000-0002-4852-2567 Home page: http://www.naturematesindia.org/