The Diet of the Kingdom of Galicia and Lodomeria, and of the Grand Duchy of Cracow was the regional assembly of the Kingdom of Galicia and Lodomeria, a crown land of the Austrian Empire, and later Austria-Hungary. In the history of the Polish parliaments, it is considered the successor of the former sejm walny, or general sejm of the Kingdom of Poland and the Polish–Lithuanian Commonwealth, and also of the sejmik, or local councils, in the territories of the Austrian Partition. It existed from 1861 until the dissolution of Austria-Hungary in 1918.

The Kingdom of Galicia and Lodomeria, also known as Austrian Galicia or colloquially Austrian Poland, was a constituent possession of the Habsburg monarchy in the historical region of Galicia in Eastern Europe. The crownland was established in 1772. The lands were annexed from the Polish-Lithuanian Commonwealth as part of the First Partition of Poland. In 1804 it became a crownland of the newly proclaimed Austrian Empire. From 1867 it was a crownland within the Cisleithanian or Austrian half of the dual monarchy of Austria-Hungary. It maintained a degree of provincial autonomy. Its status remained unchanged until the dissolution of the monarchy in 1918.