Jennifer Lyn Marcroft is a New Zealand politician and Member of Parliament in the House of Representatives for the New Zealand First party.

New Zealand First, commonly abbreviated to NZ First or NZF, is a political party in New Zealand, led by and identified with veteran politician Winston Peters, who has served three times as deputy prime minister. The party has formed coalition governments with both major political parties in New Zealand: with the New Zealand National Party from 1996 to 1998 and 2023 to present, and with the New Zealand Labour Party from 2005 to 2008 and 2017 to 2020. New Zealand First currently serves in a coalition government with both National and ACT as part of the Sixth National government, having won 6.08% of the total party vote in the 2023 New Zealand general election.