Army Group Archduke Karl () was an army group of Austria-Hungary during World War I, established in June 1916 to fight against the Russian Empire on the Eastern Front and later in the campaign against the Kingdom of Romania. It was named for its commander, Field Marshal Archduke Karl Franz Joseph, who commanded the formation until October 1916. The following month, he became the last emperor of Austria-Hungary. The army group consisted of the 1st and 7th Armies.