Zoi Katherine Sadowski-Synnott MNZM (/ˈzoʊ.i/, born 6 March 2001) is a New Zealand snowboarder, specialising in slopestyle and big air competitions.

[2] Sadowski-Synnott was born in Sydney, New South Wales, Australia,[3] to a New Zealand father, Sean Synnott, and an American mother, Robin Sadowski.

[15] In January 2019, Sadowski-Synnott claimed the gold medal in the slopestyle event, and the silver in the big air, at the Winter X Games in Aspen, Colorado.

[18] In January 2021, she claimed the silver medal in the slopestyle event, and the bronze in the big air, at the Winter X Games in Aspen, Colorado.

[20] In December 2021, Sadowski-Synnott claimed victory in the women’s snowboard slopestyle event at the invite-only Winter Dew Tour in Copper Mountain, Colorado.

[26] In the 2023 New Year Honours, Sadowski-Synnott was appointed a Member of the New Zealand Order of Merit, for services to snow sports.