Calvyn Justus (born 14 December 1995) is a South African swimmer.

He represented South Africa in the men's 4 × 200 metre freestyle relay at the 2016 Summer Olympics.

[1] He is an alumnus of Westville Boys' High School.

[2] In 2018, Justus secured a bronze medal in the 4x100 medley relay at the Commonwealth Games, along with teammates Chad Le Clos, Cameron van der Burgh and Brad Tandy.

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