Lalon, also known as Lalon Sain, Lalon Shah, Lalon Fakir or Mahatma Lalon (c. 1772 – 17 October 1890; Bengali: 1 Kartik, 1179), was a Bengali Baul saint, mystic, songwriter, social reformer and thinker. Considered an archetypal icon of Bengali culture, Lalon inspired and influenced many poets, social and religious thinkers including Rabindranath Tagore, Kazi Nazrul Islam, and Allen Ginsberg albeit he "rejected all distinctions of caste and creed". Though generally celebrated as an epitome of religious tolerance, he was also accused of heresy during his lifetime and after his death. Throughout his life, Lalon sang of a society where all religions and beliefs are in harmony. His disciples live mostly in Bangladesh and West Bengal. He founded the institute known as Lalon Akhrah in Cheuriya, about from Kushtia railway station. Every year on the occasion of his death anniversary, thousands of his disciples and devotees assemble at Lalon Akhrah, and pay homage to the departed guru through celebration and discussion of his songs and philosophy for three days. In 2004, Lalon was placed at number 12 in the BBC's poll of the Greatest Bengali of All Time.
Lalon is a 2004 Bangladeshi film directed by Tanvir Mokammel.