Geetha was born as the eldest daughter of Wijaya, a journalist and Udula Kumarasinghe. She grew up in Bentara, Alpitiya and had her education at Sangamitta Girl's School, Hamburagala and Holy Family Convent, Kalutara.

Geetha Samanmali Kumarasinghe was born July 5, 1955 in Badulla. She is an award winning Sri Lankan film actress. She made her debut with veteran director K.A.W. Perera's Wasana in 1975 but it was Neil Rupasinghe's Lassana Kella which was released first. Since then, she has made her mark in over 80 movies, winning the prestigious Sarasaviya Best Actress Award four times, in 1991, 1996, 2000 and 2004. She was also one of the few actresses to receive the Sarasaviya Most Popular Actress Award several times.