Haridwar is regarded as one of the seven holiest places (Sapta Puri) toHindus. According to the Samudra manthan, Haridwar along with Ujjain,Nashik and Prayag (Allahabad) is one of four sites where drops of Amrit, the elixir of immortality, accidentally spilled over from the pitcher while being carried by the celestial bird Garuda. This is manifested in the Kumbha Mela being celebrated every 3 years in one of the 4 places, and thus every 12 years in Haridwar. Amidst the Kumbha Mela, millions of pilgrims, devotees, and tourists congregate in Haridwar to perform ritualistic bathing on the banks of the river Ganges to wash away their sins to attain Moksha. Brahma Kund, the spot where the Amrit fell, is located at Har ki Pauri (literally, “footsteps of the Lord”) and is considered to be the most sacred ghat of Haridwar.

In the scriptures, Haridwar has been variously mentioned as Kapilasthana, Gangadwara and Mayapuri. It is also an entry point to the Char Dham (the four main centres of pilgrimage in Uttarakhand viz, Badrinath, Kedarnath, Gangotri, and Yamunotri), hence, Shaivaites (followers of Lord Shiva) and Vaishnavites (followers of Lord Vishnu) call this place Hardwar and Haridwar respectively, corresponding to Hara being Shiv and Hari being Vishnu.

In the Vanaparva of the Mahabharat, where sage Dhaumya tells Yudhisthira about the tirthas of India, Gangadwar, i.e., Haridwar and Kankhal, have been referred to,[9] the text also mentions that Agastya Rishi did penance here, with the help of his wife, Lopamudra (the princess of Vidharba).

The legendary King, Bhagiratha, the great-grandson of the Suryavanshi King Sagar (an ancestor of Rama), is said to have brought the river Ganges down from heaven, through years of penance in Satya Yuga, for the salvation of 60,000 of his ancestors from the curse of the saint Kapila, a tradition continued by thousands of devout Hindus, who brings the ashes of their departed family members, in hope of their salvation.[12] Lord Vishnu is said to have left his footprint on the stone that is set in the upper wall of Har Ki Pauri, where the Holy Ganges touches it at all times.

Haridwar came under the rule of the Maurya Empire (322–185 BCE), and later under the Kushan Empire (c. 1st–3rd centuries). Archaeological findings have proved that terra cotta culture dating between 1700 BCE and 1200 BCE existed in this region. First modern era written evidence of Haridwar is found in the accounts of a Chinese traveller, Huan Tsang, who visited India in 629 AD. during the reign of King Harshavardhan (590–647) records Haridwar as ‘Mo-yu-lo’, the remains of which still exist at Mayapur, a little to the south of the modern town. Among the ruins are a fort and three temples, decorated with broken stone sculptures, he also mentions the presence of a temple, north of Mo-yu-lo called ‘Gangadwara’, Gateway of the Ganges.

The city also fell to the Central Asian conqueror Timur Lang (1336–1405) on 13 January 1399.

During his visit to Haridwar, first Sikh Guru, Guru Nanak (1469–1539) bathed at ‘Kushawart Ghat’, wherein the famous, ‘watering the crops’ episode took place, his visit is today commemorated by a gurudwara (Gurudwara Nanakwara), according to two Sikh Janamsakhis, this visit took place on the Baisakhi day in 1504 AD, he later also visited Kankhal en route to Kotdwara in Garhwal. Pandas of the Haridwar have been known to keep genealogy records of most of the Hindu population. Known as vahis, these records are updated on each visit to the city, and are a repository of vast family trees of family in North India.

Ain-e-Akbari, written by Abul Fazal in the 16th century during the reign of Mughal Emperor Akbar, refers to it as Maya (Mayapur), known as Hardwar on the Ganges”, as seven sacred cities of Hindus. It further mentions it is eighteen kos (each approx. 2 km) in length, and large numbers of pilgrims assemble on the 10th of Chaitra. It also mentions that during his travels and also while at home, Mughal Emperor, Akbar drank water from the Ganges river, which he called ‘the water of immortality’. Special people were stationed at Sorun and later Haridwar to dispatch water, in sealed jars, to wherever he was stationed.

During the Mughal period, there was mint for Akbar’s copper coinage at Haridwar. It is said that Raja Man Singh of Amber, laid that foundation of the present day city of Haridwar and also renovated the ghats at Hark Ki Pauri. After his death, his ashes are also said to have been immersed at Brahma Kund by Mughal emperor Akbar himself. Thomas Coryat, an English traveller, who visited the city in the reign of Emperor Jahangir (1596–1627) mentions it as ‘Haridwara’, the capital of Shiva.

Being one of the oldest living cities, Haridwar finds its mention in the ancient Hindu scriptures as it weaves through the life and time stretching from the period of the Buddha, to the more recent British advent. Haridwar has a rich and ancient religious and cultural heritage. It still has many old havelis and mansions bearing exquisite murals and intricate stonework.

One of the two major dams on the river Ganges, the Bhimgoda, is situated here. Built in 1840s, it diverts the waters of the Ganges to the Upper Ganges Canal, which irrigated the surrounding lands. Though this caused severe deterioration to the Ganges water flow, and is a major cause for the decay of the Ganges as an inland waterway, which till 18th century was used heavily by the ships of the East India Company, and a town as high up as Tehri, was considered a port city The headworks of the Ganges Canal system are located in Haridwar. The Upper Ganges Canal was opened in 1854 after the work began in April 1842, prompted by the famine of 1837–38. The unique feature of the canal is the half-kilometre-long aqueduct over Solani river at Roorkee, which raises the canal 25 metres above the original river.

Haridwar as a part of the United Province, 1903 : ‘Haridwar Union Municipality’ was constituted in 1868, which included the then villages of Mayapur and Kankhal. Haridwar was first connected with railways, via Laksar, through branch line in 1886, when the Awadh and Rohilakhand Railway line was extended through Roorkee to Saharanpur, this was later extended to Dehradun in 1900. In 1901, it had a population of 25,597 and was a part of the Roorkee tehsil, in Saharanpur district of the United Province, and remained so till the creation of Uttar Pradesh in 1947.