The Hellenic Society for Archaeometry (HSA) was founded in 1982. It constitutes one of the oldest European associations dedicated to scientific archaeology with hundreds of registered members, both in Greece and abroad. The HSA's main concern is to promote the application of science and technology in archaeology, history of art, and other fields related to cultural heritage. The 7th Symposium of the HSA took place in autumn 2019 (October 9-12) at the Byzantine and Christian Museum in Athens. Its theme was 'Archaeology-Archaeometry, 30 years on', chosen to celebrate the 30th anniversary of the 1st Symposium of HSA back in 1990, which bore the emblematic title 'Linking Archaeology and Archaeometry'. During the 3-day symposium, more than 100 original and stimulating papers were presented orally and/or in poster form. This volume of proceedings includes a representative selection of contributions, covering a wide range of fields in archaeological science, such as provenance and technology of archaeomaterials, geo- and bio-archaeology, dating and landscape studies, as well as papers illuminating the origins of archaeometry in Greece.