Mindelheim (German: [ˈmɪndl̩ˌhaɪ̯m] ) was a minor state of Unterallgäu in Bavaria, Germany. It was part of the territory of Rechberg until 1467 when it was made a Lordship for the House of Frundsberg. It was raised to a Barony in 1569, was annexed by Maxelrain in 1586, annexed by Leuchtenberg in 1618, and created a Principality for John Churchill, Duke of Marlborough, in 1705 for his service in the War of the Spanish Succession.