Remnants of civilisation in the greater Bengal region date back 4,000 years when the region was settled by Dravidian, Tibeto-Burman and Austro-Asiatic peoples.

The exact origin of the word Bangla or Bengal is unknown, though it is believed to be derived from the Dravidian speaking tribe Bang that settled in the area around the year 1000 BC.

After the arrival of Indo-Aryans, the kingdom of Magadha was formed in 7th century BC, consisting of the Bihar and Bengal regions. It was one of the four main kingdoms of India at the time of Buddha and was one of the sixteen Mahajanapadas.

Under the Maurya dynasty founded by Chandragupta Maurya, the Magadha Empire extended over nearly all of South Asia, including parts of Persia and Afghanistan under Ashoka the Great in the 3rd century BC.

From the 3rd to the 6th centuries AD, the kingdom of Magadha served as the seat of the Gupta Empire. The first recorded independent king of Bengal was Shashanka, reigning around early 7th century.

After a period of anarchy, the Buddhist Pala dynasty ruled the region for 400 years, followed by a shorter reign of the Hindu Sena dynasty. Islam was introduced to Bengal in the twelfth century by Sufi missionaries.
Subsequent Muslim conquests by the Delhi Sultanate helped spread Islam throughout the region.

In the 16th century, Mughal general Islam Khan conquered Bengal and the region was administered by governors appointed by the court of the Mughal Empire.

This led to semi independence of the area under the Nawabs of Murshidabad who nominally respected the sovereignty of the Mughals in Delhi.

European traders arrived late in the fifteenth century. Their influence grew until the British East India Company gained taxation rights in the Bengal subah (province) following the Battle of Plassey in 1757 when Siraj ud-Daulah the last independent Nawab was defeated by the British.

The Bengal Presidency was established by 1765 eventually including all British territories north of the Central Provinces (now Madhya Pradesh), from the mouths of the Ganges and the Brahmaputra to the Himalayas and the Punjab.

The Bengal famine of 1770 claimed millions of lives. Calcutta was named the capital of British India in 1772. The Bengal Renaissance and Brahmo Samaj socio cultural reform movements had great impact on the cultural and economic life of Bengal.

The failed Indian rebellion of 1857 started in Kolkata and resulted in transfer of authority to the British Crown administered by the Viceroy of India. Between 1905 and 1911, an abortive attempt was made to divide the province of Bengal into two zones.

Bengal played a major role in the Indian independence movement. Armed attempts against the British Raj from Bengal reached a climax when Subhash Chandra Bose led the Indian National Army against the British.

In 1947, Bengal was partitioned along religious lines; the western part went to India and the eastern part joined Pakistan as a province called East Bengal (later renamed East Pakistan, giving rise to Bangladesh in 1971).

On October 2, 1955, the former French enclave of Chandannagar, which had passed into Indian control after 1950, was integrated into West Bengal; portions of Bihar were subsequently merged with West Bengal.

During the 1960s and 1970s, severe power shortages, strikes and a violent Marxist-Naxalite movement damaged much of the states infrastructure, leading to a period of economic stagnation.

The Bangladesh Liberation War of 1971 resulted in the influx of millions of refugees to West Bengal causing significant strains on its infrastructure.

West Bengal politics underwent a major change when the Left Front won the 1977 assembly election defeating the incumbent Indian National Congress. The Left Front led by CPI(M) has governed for the last three decades.

The states economic recovery gathered momentum after economic reforms in India were introduced in the mid 1990s by the central government, aided by the election of a new reformist Chief Minister in 2000.