Mandsaur or Mandsaor is a city and district of Madhya Pradesh state of central India.

Mandsaur and its neighborhood are full of archaeological interest. An inscription discovered near the town indicated the erection of a temple of the sun in 437, and at Sondani are two great monolith pillars recording a victory of Yasodharman , king of Malwa, in 528. The fort dates from the 14th and 15th centuries. Hindu and Jain remains are numerous, though the town is predominantly Muslim.

Before India's independence in 1947, Madsaur was part of the princely state of Gwalior. It gave its name to the treaty with the Holkar Maharaja of Indore, which concluded the Third Anglo-Maratha War and the Pindari War in 1818. At the turn of the 20th century it was a centre of the Malwa opium trade.

Mandsaur District

Mandsaur District has an area of 9,791 sq. km., and a population of 1,555,481 (1991 census). The district is bounded by Neemuch District to the north, Rajasthan state to the east and west, and Mandsaur District to the south. It is part of Ujjain Division.