Mitchell Josef Santner (মিচেল জোসেফ স্যান্টনার) is a New Zealand international cricketer and current captain of New Zealand Cricket team in limited overs cricket. Domestically, he plays for Northern Districts cricket team. He is a bowling all-rounder who bats left-handed, and bowls slow left-arm orthodox spin. He has been involved in the highest 7th wicket partnership for New Zealand in Tests. Occasionally he plays golf as well. He was a part of the New Zealand squad to finish as runners-up at the 2019 Cricket World Cup. He captained the New Zealand team in the 2025 ICC Champions Trophy, where they ended up as runners-up in an enthralling final clash against India.

Santner was educated at Hamilton Boys' High School.

In April 2015, Santner was named in the New Zealand limited-overs squad for the tour of England. He made his One Day International debut for New Zealand on 9 June 2015. His first international wicket was when he trapped fellow debutant Sam Billings for 3. During the fourth ODI in the same series he hit 28 runs off Adil Rashid in one over, which is the second highest runs off one over ever posted in England. He made his Twenty20 International debut in the same series on 23 June 2015.

In November 2020 Santner led the New Zealand side for the first time in a T20 against West Indies at Bay Oval, Mount Maunganui. In August 2021, Santner was named in New Zealand's squad for the 2021 ICC Men's T20 World Cup.

In 2022 Santner became New Zealand's 24th ODI captain when he led the side in the only ODI against Scotland in Edinburgh.