Tatjana Smith (née Schoenmaker; born 9 July 1997) is a South African retired swimmer who specialised in breaststroke events.

[7] On the third day of competition, she won the 200-metre breaststroke national title with a South African record time of 2:20.17.

[8] The fourth and final day, she won a third national title in an individual breaststroke event, this time finishing first in the final of the 100-metre breaststroke with a South African record time of 1:05.74, which was 1.66 seconds faster than silver medalist Lara van Niekerk.

[10] Smith entered the delayed 2020 Summer Olympics in Tokyo, Japan as the number one seed and predicted winner of the 200-metre breaststroke.

[22] In the final, Smith set a new world record in the 200-metre breaststroke with her time of 2:18.95 and won the gold medal.

[33][34] In June, she was named as one of twelve women on the South Africa swim team for the 2022 Commonwealth Games.

[35] For the preliminaries of the 50-metre breaststroke, on day one, in swimming at the 2022 Commonwealth Games, Smith swam a 30.76 and qualified for the semifinals ranking fourth.

[39] The next morning, she ranked first in the preliminaries of the 200-metre breaststroke by over three full seconds with her time of 2:21.76, qualifying for the evening final.

[40] She won the gold medal in the final, swimming 1.20 seconds slower than the Games record of 2:20.72 set by Leisel Jones of Australia in 2006 with her time of 2:21.92.