Harshdeep Kaur (born 16 December 1986) is an Indian playback singer known for her Bollywood Hindi, Punjabi, English and Sufi songs. She is popularly known as "Sufi Ki Sultana" because of her soulful Sufi renditions. After winning titles in two reality shows, Kaur established herself as a lead singer in Bollywood soundtracks. Kaur was sixteen years old when she released her first Bollywood song, "Sajna Mai Haari".

Kaur has recorded songs for film music in multiple Indian languages, including Hindi, Punjabi, Malayalam, Tamil and Urdu, and has established herself as a leading playback singer of Indian cinema. She has worked with leading music directors (including A R Rahman, Pritam Chakraborty, Vishal–Shekhar, Salim–Sulaiman, Shankar–Ehsaan–Loy, Amit Trivedi, Shantanu Moitra, Tanishk Bagchi, Himesh Reshammiya, Sanjay Leela Bhansali, Sohail Sen. She's one of the very few Indian singers to have sung for a Hollywood film. Her track R.I.P., composed by AR Rahman, was a part of Oscar-winning director Danny Boyle's film 127 Hours. She has also sung a few songs for the Pakistani film and television industry.

Some of her popular songs include Katiya Karun from Rockstar; Dilbaro from Raazi; Heer from Jab Tak Hai Jaan; Ik Onkar from Rang De Basanti; Zaalima from Raees; Nachde Ne Saare from Baar Baar Dekho; Bari Barsi from Band Baaja Baaraat; Kabira from Yeh Jawaani Hai Deewani; Jugni ji from Cocktail; and Twist Kamariya from Bareilly ki Barfi.

In 2019, Kaur received the IIFA Award for Best Female Playback Singer award at the 20th IIFA Awards for the song "Dilbaro" from the film Raazi. She also won the Star Screen Award, Zee Cine Award for the same song Dilbaro.