| Birth Date: | 25 May 1959 |
Greta "Greet" Mettina Hellemans (born 25 May 1959 in Groningen) is a former rower from the Netherlands, who won the silver medal in the Women's Double Sculls at the 1984 Summer Olympics in Los Angeles, California, partnering with her sister Nicolette.
At the same tournament Hellemans at her second Olympic appearance was also a member of the bronze winning team in the Women's Eights, alongside Marieke van Drogenbroek, Lynda Cornet, Harriet van Ettekoven, Nicolette Hellemans, Martha Laurijsen, Catharina Neelissen, Anne Quist, and Wiljon Vaandrager.