Tyrannion the Younger was a Greek grammarian who lived and worked in Rome during the 1st century BCE. He was the son of Artemidorus of Tarsus and a student of the more famous scholar Tyrannion of Amisus, which is why he is called "the Younger." His life is known only from brief mentions in later historical sources.

He played a role in the intellectual circles of late Republican Rome. According to these sources, he was an associate of the Roman scholar Varro and is also recorded as having been a teacher of the geographer Strabo. His professional focus was on grammar, which in the ancient world included the study of language, literature, and poetic form.

Only one of his works is known: a treatise titled On Meters. This work has not survived to the present day, and no direct quotations from it are preserved. Consequently, his specific ideas and contributions to the study of poetic meter cannot be assessed.

Tyrannion the Younger is considered a minor figure, but he is historically significant for his connections. His career illustrates the network of Greek scholars who worked in Rome, helping to transmit Greek literary and grammatical knowledge to influential Roman intellectuals and their students.