Heinrich Klaasen is a South African cricketer who plays for the South African national cricket team in limited overs cricket. Previously in 2021, Klaasen captained South Africa for the first time in a T20I match. He is considered one of the most destructive players in limited overs cricket in the modern era. Renowned for his adept power-hitting capabilities, he demonstrates proficiency as a wicket-keeper, coupled with exceptional prowess as a finisher within the contemporary cricketing landscape. His remarkable statistics against spin bowling have established him as a coveted asset for T20 franchises. He has reported to be retained by the Sunrisers Hyderabad franchise for INR 23 Crores for the IPL 2025.

In August 2017, Klaasen was named in Nelson Mandela Bay Stars' squad for the first season of the T20 Global League. However, in October 2017, Cricket South Africa initially postponed the tournament until November 2018, with it being cancelled soon after.

On 2 April 2018, Klaasen joined the Indian Premier League side Rajasthan Royals replacing Steve Smith.

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.