Kyriakos S. Pittakis (also Pittakys; Greek: Κυριακός Σ. Πιττάκης; 1798 – 4 November [O.S. 23 October] 1863) was a Greek archaeologist. He was the first Greek to serve as Ephor General of Antiquities, the head of the Greek Archaeological Service, in which capacity he carried out the conservation and restoration of several monuments on the Acropolis of Athens. He has been described as a "dominant figure in Greek archaeology for 27 years", and as "one of the most important epigraphers of the nineteenth century".
Pittakis was largely self-taught as an archaeologist, and one of the few native Greeks active in the field during the late Ottoman period and the early years of the Kingdom of Greece. He played an influential role in the early years of the Greek Archaeological Service and was a founding member of the Archaeological Society of Athens, a private body which undertook the excavation, conservation and publication of archaeological finds. He was responsible for much of the early excavation and restoration of the Acropolis, including efforts to restore the Erechtheion, the Parthenon, the Temple of Athena Nike and the Propylaia. As ephor of the Central Public Museum for Antiquities from 1836, and later as Ephor General, he was largely responsible for the conservation and protection of many of the monuments and artefacts then known from Ancient Greece.