An interior minister (sometimes called a minister of internal affairs or minister of home affairs) is a cabinet official position that is responsible for internal affairs, such as public security, civil registration and identification, emergency management, supervision of regional and local governments, conduct of elections, public administration and immigration (including passport issuance) matters.
In Hong Kong, the Secretary for Home Affairs is responsible for matters relating to communities, culture, sports and local governance.
The Ministry of Home Affairs in India (MHA) is responsible for internal security and demographics, promoting the official languages.
As such it heads such functions as the internal intelligence, and police and Civil Services of India, also handling protocol, freedom-fighter pensions and manning of the courts.
National security and immigration matters fall under the Ministry of Justice, whilst the Ministry of Internal Affairs and Communications handles the administrative system, local government, elections, telecommunication and post matters.