Uttar Pradesh is a state in northern India. With over 241 million inhabitants, it is the most populated state in India as well as the most populous country subdivision in the world – more populous than all but four other countries outside of India (China, US, Indonesia, and Pakistan)[14] – and accounting for 16.5 percent of the population of India or around 3 percent of the total world population. The state is bordered by Rajasthan to the west, Haryana, Himachal Pradesh and Delhi to the northwest, Uttarakhand and Nepal to the north, Bihar to the east, Madhya Pradesh, Chhattisgarh and Jharkhand to the south. It is the fourth-largest Indian state by area covering 243,286 km2 (93,933 sq mi), accounting for 7.3 percent of the total area of India. Lucknow serves as the state capital, with Prayagraj being the judicial capital. It is divided into 18 divisions and 75 districts.

Uttar Pradesh was established in 1950 after India had become a republic. It is a successor to the United Provinces, established in 1935 by renaming the United Provinces of Agra and Oudh, in turn established in 1902 from the North-Western Provinces and the Oudh Province. Though long known for sugar production, the state's economy is now dominated by the services industry. The service sector comprises travel and tourism, hotel industry, real estate, insurance and financial consultancies. The economy of Uttar Pradesh is the third-largest state economy in India, with ₹18.63 lakh crore (US$220 billion) in gross domestic product and a per capita GSDP of ₹68,810 (US$810).[9] The High Court of the state is located in Prayagraj. The state contributes 80 seats to the lower house Lok Sabha and 31 seats and the upper house Rajya Sabha.

On 9 November 2000, a new state, Uttaranchal (now Uttarakhand), was created from Uttar Pradesh's western Himalayan hill region. The two major rivers of the state, the Ganges and its tributary Yamuna, meet at the Triveni Sangam in Prayagraj, a Hindu pilgrimage site. Other notable rivers are Gomti and Saryu. The forest cover in the state is 6.1 percent of the state's geographical area. The cultivable area is 82 percent of the total geographical area, and the net area sown is 68.5 percent of the cultivable area.

Inhabitants of the state are called Awadhi, Brajwasi, or Bundeli, depending upon their region of origin. Hinduism is practised by more than three-fourths of the population, followed by Islam. Hindi is the most widely spoken language and is also the official language of the state, along with Urdu. Uttar Pradesh was home to most of the mainstream political entities that existed in ancient and medieval India including the Maurya Empire, Harsha Empire, Gupta Empire, Pala Empire, Delhi Sultanate and Mughal Empire as well as many other empires. At the time of the Indian independence movement in the early 20th century, there were three major princely states in Uttar Pradesh – Ramgadi, Rampur and Benares and served as a focal point for the 1857 rebellion against British rule. The state houses several holy Hindu temples and pilgrimage centres. Along with several historical, natural and religious tourist destinations, including Agra, Aligarh, Ayodhya, Bareilly, Gorakhpur, Kanpur, Kushinagar, Lucknow, Mathura, Meerut, Prayagraj, Varanasi, and Vrindavan, Uttar Pradesh is also home to three World Heritage sites.