The Maratha Empire, also referred to as the Maratha Confederacy, was an early modern polity in the Indian subcontinent. It comprised the realms of the Peshwa and four major independent Maratha states under the nominal leadership of the former.

The Marathas were a Marathi-speaking peasantry group from the western Deccan Plateau (present-day Maharashtra) that rose to prominence under leadership of Shivaji (17th century), who revolted against the Bijapur Sultanate and the Mughal Empire for establishing "Hindavi Swarajya" (lit. 'self-rule of Hindus'). The religious attitude of Emperor Aurangzeb estranged non-Muslims, and the Maratha insurgency came at a great cost for his men and treasury. The Maratha government also included warriors, administrators, and other nobles from other Marathi groups. Shivaji's monarchy, referred to as the Maratha Kingdom, expanded into a large realm in the 18th century under the leadership of Peshwa Bajirao I. Marathas from the time of Shahu I recognised the Mughal emperor as their nominal suzerain, similar to other contemporary Indian entities, though in practice, Mughal politics were largely controlled by the Marathas between 1737 and 1803.

After Aurangzeb's death in 1707, Shivaji's grandson Shahu under the leadership of Peshwa Bajirao revived Maratha power and confided a great deal of authority to the Bhat family, who became hereditary peshwas (prime ministers). After he died in 1749, they became the effective rulers. The leading Maratha families – Scindia, Holkar, Bhonsle, and Gaekwad – extended their conquests in northern and central India and became more independent. The Marathas' rapid expansion was halted with the great defeat of Panipat in 1761, at the hands of the Durrani Empire. The death of young Peshwa Madhavrao I marked the end of Peshwa’s effective authority over other chiefs in the empire. After he was defeated by the Holkar dynasty in 1802, the Peshwa Baji Rao II sought protection from the British East India Company, whose intervention destroyed the confederacy by 1818 after the Second and Third Anglo-Maratha Wars.

The structure of the Maratha state was that of a confederacy of four rulers under the leadership of the Peshwa at Poona (now Pune) in western India. These were the Scindia, the Gaekwad based in Baroda, the Holkar based in Indore and the Bhonsle based in Nagpur. The stable borders of the confederacy after the Battle of Bhopal in 1737 extended from modern-day Maharashtra in the south to Gwalior in the north, to Orissa in the east or about a third of the subcontinent.^{[citation needed]}

The Maratha Empire is also referred to as the Maratha Confederacy. Historian Barbara Ramusack notes, "neither term is fully accurate since one implies a substantial degree of centralisation and the other signifies some surrender of power to a central government and a longstanding core of political administrators". Historian Stewart Gordon argues against using the term "confederacy" because it implies long-term, stable power-sharing, which did not characterize the Maratha state. Instead, power dynamics within the Maratha leadership frequently changed, sometimes as often as each decade.

Some scholars prefer the term "Maratha Raj" or "Maratha rule," emphasizing the state's unique blend of centralized and decentralized authority. This structure enabled both territorial expansion and regional autonomy.

Colonial historians occasionally used terms such as the Hindu Confederacy or the Indian Confederacy when referring to the coalition of the Maratha chiefs.

Although at present, the word Maratha refers to a traditionally Marathi peasantry group, in the past the word has been used to describe all Marathi people.