Rani Sada Kaur (1762 – 1832) was a Sikh leader. She served as the Chief of the Kanhaiya Misl from 1789 to 1821, following the death of her husband Gurbaksh Singh Kanhaiya, the heir to Jai Singh Kanhaiya, the leader of the Kanhaiya Misl, and she is sometimes referred to as Sardarni Sada Kaur.

Described as intelligent and ambitious, Rani Sada Kaur was instrumental in guiding a young Ranjit Singh to found the Sikh Empire. She played an important role in the rise and consolidation of Sikh power in Punjab.