Ahmednagar Fort, Military fort in Ahmednagar, India

Ahmednagar Fort is a military fortification in Ahilyanagar, India, featuring a circular layout with walls rising 18 meters (59 feet) high. The structure is supported by 22 bastions and has a perimeter of 1.7 kilometers (1.1 miles), surrounded by a moat.

Malik Ahmad Nizam Shah I, founder of the Nizam Shahi dynasty and namesake of Ahmednagar, built the fort in 1427 to defend the city against invaders from neighbouring Idar. It was first made of mud; major fortification work under Hussain Nizam Shah began in 1559 and was finished in 1563. Chand Bibi repulsed a Mughal attack in 1596, but Akbar took the fort in 1600. Aurangzeb died near it on 3 March 1707.

During the pre-independence era, the compound served as a prison where Jawaharlal Nehru wrote 'The Discovery of India'. Other leaders of the freedom struggle were also detained here.

The compound remains under the administration of the Indian Army through its Armoured Corps, so visitors need special permission to enter. It is advisable to contact authorities in advance to clarify visiting arrangements.

The fort is also called Bhuikot Killa, meaning a land fort, because it stands on level ground rather than a hill; it should not be confused with other Bhuikot Killas in Maharashtra such as the one at Solapur. In 1803 its ditch held about 9 feet of water, with long reeds growing in it all around.