Mariella Greta Venter (born 10 January 2000) is a South African competitive swimmer who specializes in the backstroke.

[1][2][3] She competed in the women's 100 metre backstroke at the 2019 World Aquatics Championships.

[4] She competed in the women's 4 x 100 metre medley relay at the 2020 Summer Olympics.

[5] Venter competes at the collegiate level for the University of Michigan.

[6] This biographical article related to a South African swimmer is a stub.