David Forsyth Main

David Forsyth Main (1831 – 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.