Dinko Ranjina (also Domenico Ragnina) (1536–1607) was a Dalmatian poet from the Republic of Ragusa. In 1556 he was accepted into the Republic's ruling Grand Council. He was married to the sister of Francesco Luccari Burina (Frano Lukarević).
Ragnina was born and died in Ragusa. He travelled to Messina in the hopes of taking up trade and eventually made his way to Florence. It was in Florence that he began to write.
His main works are 27 Italian sonnets in the collection Rime scelte da diversi eccelenti autori from 1563. He even wrote the Croatian songbook Pjesni razlike.