Cadambi Sheshachar Venkatachar (11 July 1899 – 16 June 1999) was an Indian Civil Servant, diplomat and the second Chief Minister of Rajasthan.

Venkatachar was educated at Maharaja's Central College, Bangalore and thence at Madras University, where he graduated in Chemistry in 1920.

[3] In 1942, he was the commissioner of Allahabad, and was appointed a Companion of the Indian Empire (CIE) in the 1946 Birthday Honours.

From 10 April 1949 to 5 January 1951, he was the Regional Commissioner and Advisor (Home and Finance) to the Rajpramukh of Rajasthan state, Maharaja Man Singh II.

After the resignation of Heera Lal Shastri, he held the office of the Chief Minister of Rajasthan from 6 January 1951 to 25 April 1951.