Most Ven Aggamaha Panditha Napane Pemasiri Thero (Sinhala: නාපාන පෙමසිරි ථෙර, romanized: Nāpāna Pemasiri Thera) also spelt either as Napane Premasiri Thero or Napane Pemasiri Thero^[1](2 January 1922/1923 – 17 November 2020) was a Sri Lankan Sinhalese Buddhist monk. He served as the 13th head of the Ramanna Nikaya since September 2012 and also served as the chief incumbent of Menikhinna Hurikaduwa Vidyasagara Privena.^[2] He was ordained on 8 July 1933.^[3]

On 3 September 2012, he was appointed as the 13th Maha Nayaka of the Ramanna Nikaya succeeding Weweldeniye Medhalankara Thero who died in August 2012.^[4][5][6] On August 16, 2019, Pemasiri and Koṭugoḍa Dhammāvāsa Thera presided over the union of the Amarapura and Rāmañña monastic orders, creating the Amarapura–Rāmañña Nikāya; both monks jointly headed the new order. Napane Pemasiri Thero died on 17 November 2020 at the age of 98 while receiving treatment at the Peradeniya Teaching Hospital.^[7][6][8] The funeral ceremony was held at Bandaranaike National school grounds, Kundasale on 22 November 2020. The funeral proceedings were held with full state honors.^[9]