A sub-divisional magistrate, also known as assistant collector, sub collector, assistant commissioner, sub-divisional officer (civil), or revenue divisional officer, is an administrative officer of a sub-division within an Indian district, exercising executive, revenue, and magisterial duties. The specific name depends on the state or union territory. Their primary responsibilities include revenue collection, maintaining law and order, overseeing developmental activities and coordinating various departments within a sub-division.

The Indian Administrative Service (IAS) is the administrative arm of the All India Services of Government of India. The IAS is one of the three All India Services along with the Indian Police Service and Indian Forest Service. Members of these three services serve the Government of India as well as the individual states. IAS officers are also deployed to various government establishments such as constitutional bodies, staff and line agencies, auxiliary bodies, public sector undertakings, regulatory bodies, statutory bodies and autonomous bodies.