The Government of India Act 1935 was the most comprehensive constitutional reform introduced by the British for colonial India. It was a result of the Round Table Conferences (1930–32) and aimed to restructure the Indian administrative and political system. The Act became the basis of governance in India until independence in 1947.

Key features of the Act included:

• Establishment of an All-India Federation, including both British Indian provinces and princely states (though federation never materialized).

• Provincial autonomy, allowing provinces to have elected governments with more power.

• Introduction of bicameral legislatures in many provinces.

• Extension of the separate electorate system.

• Creation of Federal Court and Reserve Bank of India.

However, the Governor-General and provincial governors retained extensive discretionary powers, which diluted Indian autonomy. The Muslim League supported the Act, seeing it as a step towards future independence, while the Congress criticized it, calling it a tool of imperial control.

Despite its flaws, the Act played a vital role in shaping future constitutions of both Pakistan and India. Many administrative structures and legal frameworks introduced by the Act were later retained after partition, making it a key milestone in South Asian political history.