The Brahmo Conference Organisation (Sammilan) was founded on 27 January 1881 at Mymensingh in Bangladesh. It is the inter-faith organisation between the Brahmos of Adi Dharma and some from Sadharan Brahmo Samaj. The stated objectives for founding the organisation are to "achieve purity in Brahmoism" by
In 1878 the 2nd. Brahmo Schism ensues resulting in formation of the Sadharan Brahmo Samaj with the support of the Adi Brahmo Samaj. The remnant "New Dispensation" (Nabobidhan) sect creates confusion that they are also Brahmos and start a Samaj at Bhowanipore called Sammilan Samaj.
In 1879 the Adi Brahmo Samaj at Kolkatta deputed Hemendranath Tagore and Aghore Mukhopadhyaya to resolve theological differences with Sivanath Sastri and Ananda Mohan Bose of the other Samaj.
In 1880 a famous proclamation is issued by 8 prominent Brahmos of Sylhet at Commila, calling inter alia for a common organisation to oppose the New Dispensation which "is totally opposed to Brahmoism".
On 27 January 1881 the organisation was formed at Mymensingh. The first President was Hemendranath Tagore, the Secretary was Sivanath Sastri and the Treasurer was Raj Chandra Chaudhuri (son-in-law of Nobin Chandra Roy). On 24 March 1881 the organisation was formally registered as a Society under the "Indian Societies Act, 1860" at Mymensingh.
