Hammalawa Saddhatissa Maha Thera (1914–1990) was an ordained Buddhist monk, missionary and author from Sri Lanka, educated in Varanasi, London, and Edinburgh.

The Maha Bodhi Society invited Saddhatissa to become a missionary (dharmaduta) monk in India like his contemporary Henepola Gunaratana.

In 1957 he traveled to London at the request of the Maha Bodhi Society and lived the rest of his life in the West.

[7] Due to spending years at SOAS, University of London, Saddhatissa developed a sensitivity to Western philosophical discourse.

His primary Western influence (in Buddhist Ethics at least) appears to be Fyodor Shcherbatskoy, followed by the Belgian philologist Louis de La Vallée-Poussin.