K. Thavamani Devi (c. 1925 – 10 February 2001) was a Sri Lankan actress who also worked in a number of Tamil films during the 1940s. Born and brought up in a wealthy family in Jaffna, Sri Lanka, her father was a successful barrister. Encouraged by her parents, Thavamani moved to Madras, India at an early age. She was from Sri Lankan Tamil heritage.

During her time in Madras, she learnt Bharata Natyam and Carnatic music, which helped her sing her own lines in many Tamil films. Her singing talents won her the honorific "Ceylon Kuyil" (). She was MGR's heroine in Rajakumaari (1947). Some of her other Tamil films include Shakuntala, Vana Mohini, Naatiya Rani, Krishna Kumar and Bhakta Kaalathi.

Later years She married a widower, Kodilinga Sankara Sastry of Rameshwaram, in November 1962 and retired to a spiritual life.MGR Remembered series by Sachi Sri Kantha, August 2013 "I married a widower Kodilinga Sastri in November 1962, and live here now forgetting my past connection to the movie world."

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