Johannes Jonathan Smit (জেজে স্মিথ) is a Namibian cricketer who made his debut for the Namibian national side in February 2012, aged 16.

A left-arm fast bowler from Keetmanshoop, Smit made his debut for the Namibian under-19 side during the 2011–12 season. He played five matches in that season's Khaya Majola Week, held in December 2011, with Namibia facing the South African domestic under-19 teams. Towards the end of the season, in February 2012, Smit was selected to make his first-class debut for the Namibian senior team. He took a single wicket on debut against Western Province in the South African Three-Day Provincial Competition, that of Mujahid Behardien. Smit played another first-class match the following season, again against Western Province. He again featured for the under-19s in Khaya Majola Week, and took seven wickets, behind only Bredell Wessels for Namibia. His twelve maiden overs at the tournament were bettered by only two players – KwaZulu-Natal's Kyle Simmonds (17) and Easterns' Vincent Moore (14).

Outside of his under-19 appearances, Smit has become a regular for the Namibian senior side in both South African domestic tournaments and international competitions, featuring at the 2013 Intercontinental Cup and WCL Championship, the 2013 World Twenty20 Qualifier, and the 2014 World Cup Qualifier. Against Kenya at the 2014 World Cup Qualifier in New Zealand, he took 3/23 from ten overs opening with Louis Klazinga, limiting Kenya to 186/8 from their 50 overs. Batting ninth in Namibia's innings, he came to the wicket with the score at 144/7, after Sarel Burger's dismissal, and subsequently scored 33 not out from 25 balls. Namibia won by two wickets (with seven balls remaining), and Smit was named man of the match.

In January 2018, he was named in Namibia's squad for the 2018 ICC World Cricket League Division Two tournament. He was a member of Namibia's squad for the 2018 Africa T20 Cup.

In March 2019, he was named in Namibia's squad for the 2019 ICC World Cricket League Division Two tournament. Namibia finished in the top four places in the tournament, therefore gaining One Day International (ODI) status. Smit made his ODI debut for Namibia on 27 April 2019, against Oman, in the tournament's final. Following the conclusion of the competition, Smit was named as the Player of the Tournament.