In India, a chief minister is the elected head of government of each state out of the 28 states and sometimes a union territory (UT). Currently, only the UTs of Delhi, Jammu and Kashmir and Puducherry have serving chief ministers. According to the Constitution of India, the governor is a state's head, but de facto executive authority rests with the chief minister.

Following elections to the State legislative assembly or Vidhan Sabha in a state, the state's governor usually invites the party (or coalition) with a majority of seats to form the government. The governor appoints and swears in the chief minister, whose council of ministers are collectively responsible to the assembly. Based on the Westminster system, given that they retain the confidence of the assembly, the chief minister's term can last for the length of the assembly's life, a maximum of five years. There are no limits to the number of terms that the chief minister can serve. A chief minister heads a state government's council of ministers and can be deputised in that role by a deputy chief minister. The chief minister generally selects the chief secretary and can also allot departments to the cabinet ministers of their state and ministers of state. They also direct the chief secretary to transfer, suspend, or promote officers of their state.

The Constitution of India sets the principle qualifications one must meet to be eligible to the office of chief minister. A chief minister must be:

An individual who is not a member of the legislature can be considered the chief minister provided they get themselves elected to the State Legislature within six months from the date of their appointment. Failing which, they would cease to be the chief minister.

The chief minister is elected through a majority in the state legislative assembly. This is procedurally established by the vote of confidence in the legislative assembly, as suggested by the governor of the state who is the appointing authority. They are elected for five years. The chief minister holds office at the pleasure of the governor.

Since, according to the constitution, the chief minister is appointed by the governor, the swearing in ceremony is held before the governor of the state.

The oath of office

I, do swear in the name of God/solemnly affirm that I will bear true faith and allegiance to the Constitution of India as by law established, that I will uphold the sovereignty and integrity of India, that I will faithfully and conscientiously discharge my duties as a Minister for the State of and that I will do right to all manner of people in accordance with the Constitution and the law without fear or favour, affection or ill-will.