Ramchandra Vidyabagish (Bengali: রামচন্দ্র বিদ্যাবাগীশ; 1786 – 2 March 1845) was an Indian lexicographer and Sanskrit scholar. His Bangabhashabhidhan, the first monolingual Bengali dictionary, was published in 1817. He taught at the Vedanta College established by Raja Rammohun Roy, and later at Sanskrit College from 1827-37. Closely associated with the work of Raja Rammohun Roy in Kolkata, he was the first secretary of the Brahmo Sabha established in 1828 and initiated Debendranath Tagore and 21 other young men into Brahmo Samaj in 1843.