Johannes Jonathan "JJ" Smit (born 10 November 1995) is a Namibian cricketer who made his senior 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 under-19 teams of the South African domestic 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 Wessells for Namibia. His twelve maiden overs at the tournament was bettered by only two players – KwaZulu-Natal's Kyle Simmonds (17) and Easterns' Vincent Moore (14).
At the 2013 ICC Africa Under-19 Championship, played in Uganda in May 2013, Smit took twelve wickets, behind only Kenya's Paramveer Singh. He was also named Player of the Final, after taking 4/17 from eight overs, including a hat-trick, to help Namibia defeat Kenya by 52 runs, and thus qualify for the 2014 Under-19 World Cup. Smit made his under-19 One Day International (ODI) debut at the World Cup, played in the United Arab Emirates in February 2014. He featured in all six of Namibia's matches at the tournament, with his eight wickets behind only Bredell Wessells (14) for Namibia. Generally opening the bowling with either Marius Delport or Kobus Brand, his best figures, 3/55, came against Australia.
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.