Marie-Clotilde-Elisabeth Louise de Riquet known as Louisa de Mercy-Argenteau, was a Belgian pianist. She was the eldest daughter of Michel Gabriel Alphonse Ferdinand de Riquet (1810–1865), created prince de Chimay 1834, for himself only, and Rosalie de Riquet de Caraman (1814–1872)
- Occupation
- pianist
- Citizenship
- Belgium
- Born
- June 3, 1837, 1837
- Died
- November 8, 1890, 1890
