Abstract: Sri Lanka had maritime trade relations even in the 6th century BC and we had famous naval ports used for maritime trade especially for maritime ‘Silk Road’ used by people who were in Greco-Roman, China, India, Persia for their foreign trade. Therefore, Sri Lanka was able to make new economic relationships. In this study, we mainly focused on Sri Lankan maritime trade relationship with Greco-Roman. Our research problem is, what was the trade relationship between Sri Lanka and Greco-Roman?. Our objective is to identify the importance of Sri Lanka along with the Greco-Roman trade. This study was conducted under the qualitative research method using a library survey. From these three sources Literary sources, especially foreign texts have many records about Sri Lanka and Greco-Roman trade. Some of those authors were Cosmos, Pliny, Ptolemy and Strabo. Some archaeological evidence was found from ports like Mahathittha, Godawaya and Kingdoms like Anuradhapura, Polonnaruwa.