Egon VIII of Fürstenberg-Heiligenberg (Ernst Egon; 21 March 1588 in Speyer – 24 August 1635 in Constance) was Imperial Count of Fürstenberg-Heiligenberg (1618–1635) and Bavarian Field-marshal, and an important military leader in the Thirty Years' War.

He was Chorbishop of Magdeburg and Strasbourg, treasurer and prebendary, Provost at St. Gereon in Cologne and of Archduke Leopold, Bishop of Passau and Strasbourg, Council and the governor in the autonomous Cathedral district of Rouffach.

[1] By imperial letters patent of 9 September 1619, he was made a warlord of the Catholic League (German) during the Thirty Years War.

[1] In 1631, Egon of Fürstenberg enforced the Edict of Restitution in Franconia and Württemberg.

[3] On 14 September 1631, during the siege of Leipzig, he commanded the right wing of the imperial troops led by General Tilly.