Romanisation of Bengali is the representation of written Bengali language in the Roman script. Various romanisation systems for Bengali are used, most of which do not perfectly represent Bengali pronunciation. While different standards for romanisation have been proposed for Bengali, none has been adopted with the same degree of uniformity as Japanese or Sanskrit.

The Bengali script has been included with the group of Indic scripts whose romanisation does not represent the phonetic value of Bengali. Some of them are the "International Alphabet of Sanskrit Transliteration" or IAST system (based on diacritics), "Indian languages Transliteration" or ITRANS (uses upper case alphabets suited for ASCII keyboards), and the National Library at Calcutta romanisation.

In the context of Bengali romanisation, it is important to distinguish transliteration from transcription. Transliteration is orthographically accurate (the original spelling can be recovered), but transcription is phonetically accurate (the pronunciation can be reproduced). English does not have all sounds of Bengali, and pronunciation does not completely reflect orthography. The aim of romanisation is not the same as phonetic transcription. Rather, romanisation is a representation of one writing system in Roman (Latin) script. If Bengali script has "ত" and Bengalis pronounce it /to/ there is nevertheless an argument based on writing-system consistency for transliterating it as "त" or "ta." The writing systems of most languages do not faithfully represent the spoken sound of the language, as famously with English words like "enough", "women", or "nation" (see "ghoti").

Portuguese missionaries stationed in Bengal in the 16th century were the first people to employ the Latin alphabet in writing Bengali books. The most famous are the Crepar Xaxtrer Orth, Bhed and the Vocabolario em idioma Bengalla, e Portuguez dividido em duas partes, both written by Manuel da Assumpção. However, the Portuguese-based romanisation did not take root. In the late 18th century, Augustin Aussant used a romanisation scheme based on the French alphabet. At the same time, Nathaniel Brassey Halhed used a romanisation scheme based on English for his Bengali grammar book. After Halhed, the renowned English philologist and oriental scholar Sir William Jones devised a romanisation scheme for Bengali and other Indian languages in general; he published it in the Asiatick Researches journal in 1801. His scheme came to be known as the "Jonesian system" of romanisation and served as a model for the next century and a half. Professor Lightner of Lahore Government College opposed it. The earliest instance of a long Bengali text printed in the Roman script was a collection of Aesop's Fables titled Oriental Fabulist, published in 1803 in six Indian languages. In 1881 an edition of Bankim Chandra Chatterjee's Durgeshnandini was published in Roman script.

At the beginning of the 20th century, Drew, an assistant professor at Eton College recommended that Indian languages be written in Roman script and for this purpose the magazine called Roman Urdu was launched.

During 1930s Suniti Kumar Chatterji suggested that Bengali be written in Roman script to eliminate spelling inconsistencies and to appeal to a pan-Indian audience. Abul Fazal Muhammad Akhtaru-d-Din, in an article titled "Bangla Bornomalar Poribortton" (বাংলা বর্ণমালার পরিবর্ত্তন, Changes in the Bengali Alphabet) published in Daily Azad on April 18, 1949, said, Rabindranath Tagore once advocated the Roman alphabet for Bengali, but later he changed his opinion.

During the Bengali language movement of the 1940s–50s, Romanization of Bengali was proposed along with other proposals regarding the determination of the state language of the then Pakistan, but like other proposals it also failed, by establishing Bengali as one of the state languages of Pakistan at that time, with its traditional letters. After 1947, many other East Pakistani academics, including Muhammad Qudrat-i-Khuda and Nazirul Islam Mohammad Sufian, supported the idea of writing Bengali in Roman script. In 1948, Mohammad Ferdous Khan opposed it in his pamphlet "The language problem of today".

Abul Fazl Muhammad Akhtar-ud-Din supported the Roman alphabet in his article entitled "Bangla Bornomalar Poribortton" (বাংলা বর্ণমালার পরিবর্ত্তন, Changes in the Bengali Alphabet) published in Daily Azad on 18 April 1949.