The Latin script, also known as the Roman script, is a writing system based on the letters of the classical Latin alphabet, derived from a form of the Greek alphabet which was in use in the ancient Greek city of Cumae in Magna Graecia. The Greek alphabet was altered by the Etruscans, and subsequently their alphabet was altered by the Ancient Romans. Several Latin-script alphabets exist, which differ in graphemes, collation and phonetic values from the classical Latin alphabet.

The Latin script is the basis of the International Phonetic Alphabet (IPA), and the 26 most widespread letters are the letters contained in the ISO basic Latin alphabet, which are the same letters as the English alphabet.

Latin script is the basis for the largest number of alphabets of any writing system and is the most widely adopted writing system in the world. Latin script is used as the standard method of writing the languages of Western and Central Europe, most of sub-Saharan Africa, the Americas, and Oceania, as well as many languages in other parts of the world.

The script is either called Latin script or Roman script, in reference to its origin in ancient Rome (though some of the capital letters are Greek in origin). In the context of transliteration, the term "romanization" (British English: "romanisation") is often found. Unicode uses the term "Latin" as does the International Organization for Standardization (ISO).

The numeral system is called the Roman numeral system, and the collection of the elements is known as the Roman numerals. The numbers 1, 2, 3 ... are Latin/Roman script numbers for the Hindu–Arabic numeral system.

The use of the letters I and V for both consonants and vowels proved inconvenient as the Latin alphabet was adapted to Germanic and Romance languages. W originated as a doubled V (VV) used to represent the Voiced labial–velar approximant /w/ found in Old English as early as the 7th century. It came into common use in the later 11th century, replacing the letter wynn ⟨Ƿ ƿ⟩, which had been used for the same sound. In the Romance languages, the minuscule form of V was a rounded u; from this was derived a rounded capital U for the vowel in the 16th century, while a new, pointed minuscule v was derived from V for the consonant. In the case of I, a word-final swash form, j, came to be used for the consonant, with the unswashed form restricted to vowel use. Such conventions were erratic for centuries. J was introduced into English for the consonant in the 17th century (it had been rare as a vowel), but it was not universally considered a distinct letter in the alphabetic order until the 19th century.

By the 1960s, it became apparent to the computer and telecommunications industries in the First World that a non-proprietary method of encoding characters was needed. The International Organization for Standardization (ISO) encapsulated the Latin alphabet in their (ISO/IEC 646) standard. To achieve widespread acceptance, this encapsulation was based on popular usage. As the United States held a preeminent position in both industries during the 1960s, the standard was based on the already published American Standard Code for Information Interchange, better known as ASCII, which included in the character set the 26 × 2 (uppercase and lowercase) letters of the English alphabet. Later standards issued by the ISO, for example ISO/IEC 10646 (Unicode Latin), have continued to define the 26 × 2 letters of the English alphabet as the basic Latin alphabet with extensions to handle other letters in other languages.

The Latin alphabet spread, along with Latin, from the Italian Peninsula to the lands surrounding the Mediterranean Sea with the expansion of the Roman Empire. The eastern half of the Empire, including Greece, Turkey, the Levant, and Egypt, continued to use Greek as a lingua franca, but Latin was widely spoken in the western half, and as the western Romance languages evolved out of Latin, they continued to use and adapt the Latin alphabet.