Penultimate rule

Latin spelling, or Latin orthography, is the spelling of Latin words written in the scripts of all historical phases of Latin from Old Latin to the present. All scripts use the same alphabet, but conventional spellings may vary from phase to phase. The Roman alphabet, or Latin alphabet, was adapted from the Old Italic script to represent the phonemes of the Latin language. The Old Italic script had in turn been borrowed from the Greek alphabet, itself adapted from the Phoenician alphabet.

The Latin alphabet most resembles the Greek alphabet around 540 BC, as it appears on the red-figures pottery of the time.

Latin pronunciation continually evolved over the centuries, making it difficult for speakers in one era to know how Latin was spoken in prior eras. A given phoneme may be represented by different letters in different periods. This article deals primarily with modern scholarship's best reconstruction of Classical Latin's phonemes (phonology) and the pronunciation and spelling used by educated people in the late Republic. This article then touches upon later changes and other variants.

The forms of the Latin alphabet used during the Classical period did not distinguish between upper case and lower case. Roman inscriptions typically use Roman square capitals, which resemble modern capitals, and handwritten text often uses old Roman cursive, which includes letterforms similar to modern lowercase.

This article uses small caps for Latin text, representing Roman square capitals, and long vowels are marked with acutes, representing apices. In the tables below, Latin letters and digraphs are paired with the phonemes they usually represent in the International Phonetic Alphabet.

In ancient Latin spelling, individual letters mostly corresponded to individual phonemes, with three main exceptions:

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