Second Northern War Melchior Graf von Gleichen und Hatzfeldt (Westerwald, 20 October 1593 – Powitzko, 9 January 1658) was an Imperial Field Marshal.

He fought in the Thirty Years' War first under Albrecht von Wallenstein and Matthias Gallas, then received an independent command in Westphalia.

Usually successful with a smaller corps on this secondary front and victorious at Vlotho and Dorsten, he lost at Wittstock and Jankau in his brief intermezzos as commander of major armies.

Entering Wallenstein's army in 1625, he became Lieutenant Colonel in the regiment of Franz Albrecht of Saxe-Lauenburg and subsequently fought in Lower Saxony, Hungary, Denmark and Mantua.

After he captured Magdeburg from them, he suffered a defeat in the Battle of Wittstock against the Swedish forces under Johan Banér and Alexander Leslie on 4 October 1636.