Mary Victoria Cracroft Grigg, Lady Polson, MBE (née Wilson; 18 August 1897 – 22 December 1971) was a New Zealand politician of the National Party.
Grigg was educated for eight years at the Brondesbury School in London, where she became a head girl.
She was elected to represent the Mid-Canterbury electorate in Parliament from 1942 after the death (on 29 November 1941) of her husband Arthur Grigg in a political practice known as widow's succession.
[2] She married William Polson MP on 29 June 1943 and did not seek re-election in the September 1943 general election.
Grigg continued to be active in the National Party after her parliamentary career ended.