The 3rd Swiss Regiment Reding was a unit of Swiss soldiers in the Spanish Army and one of several Swiss regiments serving the Spanish Crown in the 18th century. The regiment was founded by a royal proclamation of Philip V in 1742 and recruited from the Canton of Schwyz in central Switzerland.

It was the third Swiss regiment in service at the time (out of about a dozen or so Swiss Regiments historically) and was the second raising of a regiment under Theodor von Reding. It is therefore either referred to as the 2nd Regiment Reding or the 3rd Swiss Regiment.

• Army of Spain (Peninsular War)

• Chartrand, René (1999). The Spanish Army of the Napoleonic Wars. Osprey Publishing. ISBN 978-1-85532-765-8.
• Foy, Maximilien Sébastien (1827). History of the war in the Peninsula under Napoleon. Vol. II. S. and R. Bentley.
• Gates, David. The Spanish Ulcer: A History of the Peninsular War. Da Capo Press 2001. ISBN 0-306-81083-2