Siri Naga I was King of Anuradhapura in the 2nd century, whose reign lasted from 189 to 209 AD. He succeeded his brother-in-law Kuda Naga as King of Anuradhapura and was succeeded by his son Voharika Tissa.
Historical texts state that he renovated Ruwanweliseya and renovated Lowamahapaya into a five storied structure and made stone steps at the entrances to the Sri Maha Bodhi.