Bengalis (Bengali: বাঙ্গালী, বাঙালি [baŋgali, baŋali] ^ⓘ), also rendered as endonym Bangalee, are an Indo-Aryan ethnolinguistic group originating from and culturally affiliated with the Bengal region of South Asia. The current population is divided between the sovereign country Bangladesh and the Indian regions of West Bengal, Tripura, Barak Valley of Assam, Andaman and Nicobar Islands, and parts of Meghalaya, Manipur and Jharkhand. Most speak Bengali, a classical language from the Indo-Aryan language family.

Bengalis are the third-largest ethnic group in the world, after the Han Chinese and Arabs. They are the largest ethnic group within the Indo–European linguistic family and the largest ethnic group in South Asia. Apart from Bangladesh and the Indian states of West Bengal, Tripura, Manipur, and Assam's Barak Valley, Bengali-majority populations also reside in India's union territory of Andaman and Nicobar Islands, with significant populations in the Indian states of Arunachal Pradesh, Delhi, Odisha, Chhattisgarh, Jharkhand, Mizoram, Nagaland and Uttarakhand as well as Nepal's Province No. 1. The global Bengali diaspora have well-established communities in the Middle East, Pakistan, Myanmar, the United Kingdom, the United States, Malaysia, Italy, Singapore, Maldives, Canada, Australia, Japan and South Korea.

Bengalis are a diverse group in terms of religious affiliations and practices. Approximately 70% are adherents of Islam with a large Hindu minority and sizeable communities of Christians and Buddhists. Bengali Muslims, who live mainly in Bangladesh, primarily belong to the Sunni denomination. Bengali Hindus, who live primarily in West Bengal, Tripura, Assam's Barak Valley, Jharkhand and Andaman and Nicobar Islands, generally follow Shaktism or Vaishnavism, in addition to worshipping regional deities. There exist small numbers of Bengali Christians, a large number of whom are descendants of Portuguese voyagers, as well as Bengali Buddhists, the bulk of whom belong to the Bengali-speaking Barua group in Chittagong and Rakhine. There is also a Bengali Jain caste named Sarak residing in Rarh region of West Bengal and Jharkhand.

Bengalis have influenced and contributed to diverse fields, notably the arts and architecture, language, folklore, literature, politics, military, business, science and technology.

The term Bengali is generally used to refer to someone whose linguistic, cultural or ancestral origins are from Bengal. The Indo-Aryan Bengalis are ethnically differentiated from the non-Indo-Aryan tribes inhabiting Bengal. Their ethnonym, Bangali, along with the native name of the Bengali language and Bengal region, Bangla, are both derived from Bangālah, the Persian word for the region. Prior to Muslim expansion, there was no unitary territory by this name as the region was instead divided into numerous geopolitical divisions. The most prominent of these were Vaṅga or Vaṅgāla (from which Bangālah is thought to ultimately derive from) in the south, Rāṛha in the west, Puṇḍravardhana and Varendra in the north, and Samataṭa and Harikela in the east.^{[citation needed]}

The historic land of Vaṅga (bôngô in Bengali), situated in present-day Barisal, is considered by early historians of the Abrahamic and Dharmic traditions to have originated from a man who had settled in the area though it is often dismissed as legend. Early Abrahamic genealogists had suggested that this man was Bang, a son of Hind who was the son of Ham (son of Noah). In contrast, the Mahabharata, Puranas and the Harivamsha state that Vaṅga was the founder of the Vaṅga kingdom and one of the adopted sons of King Vali. The land of Vaṅga later came to be known as Vaṅgāla (Bôngal) and its earliest reference is in the Comilla copperplates (720 CE) of earlier Buddhist Deva King Anandadeva where he was mentioned in the title of Sri Vaṅgāla Mrigānka, means the moon of Bengal. Another reference is the Nesari plates (805 CE) of Govinda III which speak of Dharmapāla as its king. The records of Rajendra Chola I of the Chola dynasty, who invaded Bengal in the 11th century, speak of Govindachandra as the ruler of Vaṅgāladeśa (a Sanskrit cognate to the word Bangladesh, which was historically a synonymous endonym of Bengal). 16th-century historian Abu'l-Fazl ibn Mubarak mentions in his ʿAin-i-Akbarī that the addition of the suffix "al" came from the fact that the ancient rajahs of the land raised mounds of earth 10 feet high and 20 in breadth in lowlands at the foot of the hills which were called "al". This is also mentioned in Ghulam Husain Salim's Riyāz us-Salāṭīn.

In 1352, Muslim nobleman Shamsuddin Ilyas Shah united the region into a single political entity known as the Bengal Sultanate. Proclaiming himself as Shāh-i-Bangālīyān, it was in this period that the Bengali language gained state patronage and corroborated literary development. Ilyas Shah had effectively unified the region into one country.

Archaeologists have discovered remnants of a 4,700-year-old Neolithic and Chalcolithic civilisation such as Dihar and Pandu Rajar Dhibi in the greater Bengal region, and believe the finds are one of the earliest signs of settlement in the region. However, evidence of much older Palaeolithic human habitations were found in the form of a stone implement and a hand axe in the upper Gandeshwari, Middle Dwarakeswar, Upper Kangsabati, Upper Tarafeni and Middle Subarnarekha valleys of the Indian state West Bengal, and Rangamati and Feni districts of Bangladesh. Evidence of 42,000 years old human habitation has been found at the foothills of the Ajodhya Hills in West Bengal. Hatpara on the west bank of Bhagirathi River has evidence of human settlements dating back to around 15,000-20,000 years.