Shamna Kasim, also known as Poorna, is an Indian film actress and model.

She started her career as a classical dancer and got into media when she was participating at the reality-based dance competition Super Dancer on Amrita TV. She made her acting debut in the 2004 Malayalam film Ennittum and went on to play minor supporting roles in a couple of unsuccessful films. She played her first major role in her debut Telugu film Sri Mahalakshmi, while essaying the lead female character in her first Tamil film, Muniyandi Vilangial Moonramandu.