David Forsyth Main

David Forsyth Main (1831–1880) was a 19th-century member of parliament in Otago, New Zealand.

Main was one of three candidates in the Gold Field Towns electorate in the 1866 election, when he came a close second to James Benn Bradshaw.

Main represented the Port Chalmers electorate from 1867 to 1870, when he retired.