Heinrich Klaasen (born 30 July 1991) is a South African cricketer who plays for the South African national cricket team. He was included in the Northerns cricket team for the 2015 Africa T20 Cup. In February 2021, Klaasen captained South Africa for the first time in a T20I match.

In February 2017, Klaasen was named in South Africa's Test squad for their series against New Zealand, but did not play.In February 2018, Klaasen was added to South Africa's One Day International (ODI) squad for their series against India, replacing an injured Quinton de Kock. He made his ODI debut against India on 7 February 2018. He won his first international man of the match award in his second ODI, in the fourth ODI of the home series against India, with a match-winning 43 runs off 27 balls.

In January 2021, Klaasen was named to captain the South Africa T20I squad for their away series against Pakistan. In April 2021, Klaasen was again named as South Africa's T20I captain, this time for their home series against Pakistan, after Temba Bavuma was ruled out due to an injury. In September 2021, Klaasen was named in the South Africa squad for the 2021 ICC Men's T20 World Cup.