Munidasa Kumaratunga (1887–1944) was a grammarian, poet, editor and language reformer, and the founder of the Hela Havula movement.
Trained as a teacher and later a school inspector, he devoted his working life to the study and reform of written Sinhala. He argued that the language had been degraded by centuries of unnecessary Sanskrit and Pali borrowing, and that a purer form — Hela — could be recovered from classical sources and made the basis of a modern literary standard. He edited classical texts, wrote grammars, published the journals Subasa and Helio, and composed poetry and children's verse of lasting popularity.
The purist programme has always been contested, and its influence on Sinhala nationalism is debated. His scholarship on classical grammar is not seriously disputed.