The Bengali–Assamese script, sometimes also known as Eastern Nagri, is an eastern Brahmic script, primarily used today for the Bengali and Assamese language spoken in eastern South Asia. It evolved from Gaudi script, also the common ancestor of the Odia and Trihuta scripts. It is commonly referred to as the Bengali script by Bengalis and the Assamese script by the Assamese, while in academic discourse it is sometimes called Eastern-Nāgarī. Three of the 22 official languages of the Indian Republic—Bengali, Assamese, and Meitei—commonly use this script in writing; Bengali is also the official and national language of Bangladesh.

Besides, Bengali and Assamese languages, it is also used to write Bishnupriya Manipuri, Meitei, Chakma, Santali and numerous other smaller languages spoken in eastern South Asia. Historically, it was used to write various Old and Middle Indo-Aryan languages, and, like many other Brahmic scripts, is still used for writing Sanskrit. Other languages, such as Bodo, Karbi, Maithili and Mising were once written in this script. The two major alphabets in this script – Assamese and Bengali – are virtually identical, except for two characters — Assamese differs from Bengali in one letter for the /r/ sound, and an extra letter for the /w/ or /v/ sound.

The Bengali–Assamese script was originally not associated with any particular regional language, but was prevalent as the main script in the eastern regions of Medieval India for Old- and Middle-Indo-Aryan including Sanskrit. All of these eastern Magadhan scripts are based on a system of characters historically related to, but distinct from, Devanagari. Brahmi, an ancient Indian syllabary, is the source of most native Indian scripts including the South Indian languages and Devanagari, the script associated with classical Sanskrit and other Indo-Aryan languages.

The modern eastern scripts (Bengali-Assamese, Odia, and Maithili) became clearly differentiated around the 14th and 15th centuries from the predecessor Gaudi. While the scripts in Bengal, Assam and Mithila remained similar to each other the Odia script developed a curved top in the 13th–14th century and became increasingly different. Old Maithili also used a script similar to the Bengali–Assamese script, and Maithili scholars (particularly of the older generation) still write Sanskrit in that script.

According to d'Hubert (2014) manuscripts written in the 17th–18th century from eastern Bihar in the west to Manipur in the east followed related scripts, that could be classed largely into three on the basis of the letter ro: (1) western - with the current Bengali ro; (2) northern - with the current Assamese ro; and (3) eastern - largely lost today with a ro not seen today.

Modern Bengali–Assamese script saw further standardisations following the introduction of printing.

Though there were early attempts to cut Bengali types it was the East India Company's interest in propagating the Bengali language that ultimately prevailed. It first commissioned William Bolts, a Dutch adventurer, to create a grammar for Bengali, but he had to leave India after he ran into trouble with the company. The first significant book with Bengali typography was Halhed's 1778 "A Grammar of the Bengal Language" which he compiled from a meagre set of six Bengali manuscripts. When Halhed turned to Warren Hastings for publishing, he was referred to Charles Wilkins, the type-founder at the Company press at Hoogly. Learned in Sanskrit and Persian, Wilkins singlehandedly cut the most complete set. He was assisted by the Bengali blacksmith, Panchanan Karmakar, who is often erroneously credited as the father of the Bengali type.

In this and other articles on Wikipedia dealing with the Assamese and Bengali languages, a Romanization scheme used by linguists specialising in Bengali phonology and a separate Assamese transliteration table used by linguists specialising in Assamese phonology are included along with IPA transcription.