Sikkim (; Nepali pronunciation: [ˈsikːim]) is a state in northeastern India. It borders the Tibet Autonomous Region of China in the north and northeast, Bhutan in the east, Province No. 1 of Nepal in the west, and West Bengal in the south. Sikkim is also close to the Siliguri Corridor, which borders Bangladesh. Sikkim is the least populous and second smallest among the Indian states. Situated in the Eastern Himalaya, Sikkim is notable for its biodiversity, including alpine and subtropical climates, as well as being a host to Kangchenjunga, the highest peak in India and third highest on Earth. Sikkim's capital and largest city is Gangtok. Almost 35% of the state is covered by the Khangchendzonga National Park – a UNESCO World Heritage Site.The Kingdom of Sikkim was founded by the Namgyal dynasty in the 17th century. It was ruled by Buddhist priest-kings known as the Chogyal. It became a princely state of British India in 1890. Following Indian independence, Sikkim continued its protectorate status with the Union of India after 1947, and the Republic of India after 1950. It enjoyed the highest literacy rate and per capita income among Himalayan states. In 1973, anti-royalist riots took place in front of the Chogyal's palace. In 1975, after the Indian Army took over the city of Gangtok, a referendum was held that led to the deposition of the monarchy and Sikkim joining India as its 22nd state.Modern Sikkim is a multiethnic and multilingual Indian state. The official languages of the state are English, Nepali, Sikkimese and Lepcha. Additional official languages include Gurung, Limbu, Magar, Mukhia, Newari, Rai, Sherpa and Tamang for the purpose of preservation of culture and tradition in the state. English is taught in schools and used in government documents. The predominant religions are Hinduism and Vajrayana Buddhism. Sikkim's economy is largely dependent on agriculture and tourism. As of 2019, the state had the fifth-smallest GDP among Indian states, although it is also among the fastest-growing.Sikkim accounts for the largest share of cardamom production in India, and is the world's second largest producer of the spice after Guatemala. Sikkim achieved its ambition to convert its agriculture to fully organic between 2003 and 2016, and became the first state in India to achieve this distinction. It is also among India's most environmentally conscious states, having banned plastic water bottles "in any government functions and meetings" and polystyrene products (throughout the state).

Gangtok ( (listen); Nepali pronunciation: [ˈɡantok]) is a city, municipality, the capital and the largest populated place of the Indian state of Sikkim. It is also the headquarters of the Gangtok District. Gangtok is in the eastern Himalayan range, at an elevation of 1,650 m (5,410 ft). The city's population of 100,000 are from different ethnicities of Sikkimese people such as Indian Gorkhas, Bhutia and Lepchas. Within the higher peaks of the Himalayas and with a year-round mild temperate climate, Gangtok is at the centre of Sikkim's tourism industry. Gangtok rose to prominence as a popular Buddhist pilgrimage site after the construction of the Enchey Monastery in 1840. In 1894, the ruling Sikkimese Chogyal, Thutob Namgyal, transferred the capital to Gangtok. In the early 20th century, Gangtok became a major stopover on the trade route between Lhasa in Tibet and cities such as Kolkata (then Calcutta) in British India. After India won its independence from the British Empire in 1947, Sikkim chose to remain an independent monarchy, with Gangtok as its capital. After Sikkim's merger with India in 1975, Gangtok continued as the state capital.