Historically, this office replaced that of the dewan of Mysore of the erstwhile Kingdom of Mysore with India's constitution into a republic. Since 1947, there have been a total of twenty-three chief ministers of Mysore (as the state was known before 1 November 1973) and Karnataka. A majority of them belonged to the Indian National Congress (INC) party, including the inaugural officeholder K. C. Reddy. The longest-serving chief minister, D. Devaraj Urs, held the office for over seven years in the 1970s. INC's Veerendra Patil had the largest gap between two terms (over eighteen years). One chief minister, H. D. Deve Gowda, went on to become the eleventh prime minister of India, whereas another, B. D. Jatti, served as the country's fifth vice president. B. S. Yediyurappa who was the first chief minister from the Bharatiya Janata Party (BJP), served as the chief minister of the state for four terms in 2007, 2008, 2018 and 2019, the only one to do so. S. R. Bommai served as the chief minister representing the Janata Parivar, whose son Basavaraj Bommai became chief minister representing the BJP in 2021 becoming the second father-son duo to serve office after HD Deve Gowda and HD Kumaraswamy. There have been six instances of president's rule in Karnataka, most recently from 2007 to 2008.
^A parenthetical number indicates that the incumbent has previously held office.
^This column only names the chief minister's party. The state government he headed may have been a complex coalition of several parties and independents; these are not listed here.
^A parenthetical number indicates that the incumbent has previously held office.
^This column only names the chief minister's party. The state government he headed may have been a complex coalition of several parties and independents; these are not listed here.
^A parenthetical number indicates that the incumbent has previously held office.
^This column only names the chief minister's party. The state government he headed may have been a complex coalition of several parties and independents; these are not listed here.
^A parenthetical number indicates that the incumbent has previously held office.
^This column only names the chief minister's party. The state government he headed may have been a complex coalition of several parties and independents; these are not listed here.
^ abcdefPresident's rule may be imposed when the "government in a state is not able to function as per the Constitution", which often happens because no party or coalition has a majority in the assembly. When President's_rule#Karnataka
^On 1 November 1973, via the Mysore State (Alteration of Name) Act, Mysore State was renamed as Karnataka.[4] Thus, Devaraj Urs was Chief Minister of Mysore between 20 March 1972 and 31 October 1973, and Chief Minister of Karnataka after that.
^According to Frontline magazine, "Following the poor performance of the Janata Party in the 1984 [general] elections (it won only four out of the 28 seats), Hegde resigned because his party had lost its popular mandate. Prime Minister Rajiv Gandhi allowed him to head a caretaker government. In the 1985 [assembly] elections, the Janata Party came to power with a comfortable majority."[6]
^According to Frontline, Hegde resigned "in February 1986 when the Karnataka High Court censured his government for the way it handled arrack bottling contracts".[6] He withdrew his resignation after a couple of days, "following pressure from his party legislators".[7]