Agellos (472 BC-) was a Naxian art merchant during the 5th century BC. In 429 BC, he helped the mercenary Kassandra investigate an ongoing propaganda campaign of anti-Myrrine graffiti; he helped her identify the materials used in the graffiti and told her that the only artist known to use the material lived at the Routsouna Waterfall. Soon after, Kassandra tracked down the perpetrator, Lichas, and forced him to end his campaign.