The Pandyan invasion of Anuradhapura was a military campaign launched by the Pandya king Srimara Srivallabha against the Anuradhapura kingdom during the reign of Sena I in the mid-9th century CE, generally dated to around 846 CE. The invasion is recorded in the Sri Lankan chronicle Mahavamsa and is corroborated by Pandyan inscriptions such as the Sinnamanur copper plates. The campaign resulted in a decisive Pandyan victory, the sack of Anuradhapura, and a subsequent treaty restoring Sena I to the throne.