Paragoge (/ˌpærəˈɡoʊdʒi/) is the addition of a sound to the end of a word. It is a type of epenthesis.

Paragoge is most often linked with the nativization of loanwords. It is particularly common in Brazilian Portuguese, not only in loanwords but also in word derivation. It is also present in the accents of many Brazilians while speaking foreign languages such as English.

Some languages have undergone paragoge as a sound change, and modern forms are longer than the historical forms they are derived from. Italian sono 'I am', from Latin sum, is an example. Sometimes, as above, the paragogic vowel is an echo vowel, such as Proto-Oceanic *saqat "bad" > Uneapa zaɣata.

The word paragoge is taken from Ancient Greek: παραγωγή 'deviation; language alteration': from παρα- prefix para- 'beside' and ἀγωγή agogē 'bringing in'.^{[citation needed]}

Some languages add a sound to the end of a loanword when it would otherwise end in a forbidden sound. Some languages add a grammatical ending to the end of a loanword to make it declinable.

Paragoge can occur in the inherited words of a language as well. This is the case with many words in Romance languages and Austronesian languages.