David Forsyth Main (1831 â 27 July 1880) was a 19th-century member of parliament in Otago, New Zealand.
Main was one of three candidates in the electorate in the , when he came a close second to James Benn Bradshaw.
Main represented the Port Chalmers electorate from to 1870, when he retired.
He was a barrister and died in Dunedin aged 48.