The 1st Foot Guards (1. Garde-Regiment zu Fuß) was an infantry regiment of the Royal Prussian Army formed in 1806. The regiment considered itself the most noble regiment of Christendom (vornehmstes Regiment der Christenheit). The regiment was disbanded in 1919, with the Infantry Regiment 9 Potsdam of the new Reichsheer bearing its tradition. The Wachbataillon of the Bundeswehr considers itself in the line of this regiment.
All Princes of Prussia were appointed lieutenants in the 1st Foot Guards upon their tenth birthdays. Chief of the regiment was always the King of Prussia.