Magdalena Franciszka Wierzycka (born 1969 in Gliwice, Poland) is a Polish-South African billionaire businesswoman. She is the co-founder and CEO of Sygnia Ltd, a financial services company. She is the richest woman in South Africa, and is also known for her anti-corruption activism. In 2020, the magazine Forbes listed her among "Africa's 50 Most Powerful Women".