George Oliver Walsh, Count of Wallis (German: Georg Olivier Graf von Wallis, Freiherr von Carrighmain; 1671, in Vienna – 19 December 1743, in Vienna) was a field marshal of Irish descent in the service of the Holy Roman Empire and the Kingdom of the Two Sicilies and last regent of the Habsburg Kingdom of Serbia (1738–1739).

George Oliver's ancestor was Richard Walsh of Carrickmines, County Dublin, who became one of the first Irish officers in imperial service in 1632.

During the War of the Spanish Succession (1701–14) he served first in northern Italy (rising to command a regiment as oberst in 1703), then from 1707 took part in the conquest of Naples.

During that period, an anecdote exists that Olivier allegedly visited Peter Czartan, a man who claimed to be 185 years old, in 1724, and grew a liking towards him, giving him gifts upon meeting him and his son.

[1][2] When the Anglo-Spanish War (1727–1729) threatened to escalate, the Holy Roman Emperor ordered Olivier back to Sicily to ready the island's defences.

On his brother Franz Paul's death in 1737 he inherited Plomnitz, Kieslingswalde, Glasegrund, Weißbrod, Altwaltersdorf, Kaiserswalde and Friedrichswald in Bohemia.

On his death in 1744 his estates were inherited by his son Stephan (died 1832), although he sold Hassitz and Stolz to Friedrich Wilhelm, count of Schlabrendorf.