Sishtla Sreeramamurthy Janaki (born 23 April 1938), commonly known as S. Janaki, is an Indian playback singer who has recorded nearly 40,000 songs, mostly in South Indian languages, in a career spanning 50 years. Kannada is the language in which she has most frequently recorded. She has won four National Film Awards and 31 different State Film Awards. Her association with singer S. P. Balasubrahmanyam and composer Ilaiyaraaja is well known.
S. Janaki, who is known as "The Nightingale of the South", is a recipient of an honorary doctorate from the University of Mysore and the Kalaimamani award from Tamil Nadu State Government. S.Janaki is called the Queen of Expressions for her ability to express different kind of emotions.
In 2013, she refused the offer of a Padma Bhushan award by the Government of India, saying that it had come "too late" and that South Indian artists were not given their due recognition.