Sir Maddur Kantharaj Urs (20 September 1870 – 3 October 1923) was an Indian royal, civil servant, and administrator who served as the 20th Dewan of Mysore from 1918 to 1922.
In 1894, Kantharaj Urs was appointed Probationary Assistant Commissioner (Schedule II) in the Mysore civil service.
After the untimely death of his brother-in-law Maharaja Chamaraja Wadiyar X in December 1894, his sister became the Queen Regent of Mysore in 1895.
In 1918, Urs succeeded Sir M. Vishveshwaraya as the Dewan of Mysore to his nephew Maharaja Krishnaraja Wadiyar IV.
Kantharaj Urs married his niece Princess Jayalakshami Amanni, the eldest daughter of his sister Maharani Kempananjammani Devi.