St. George's Austrian High School (Turkish: Sankt Georg Avusturya Lisesi, German: Österreichisches Sankt Georgs-Kolleg) is a private Austrian-Turkish high school located in Karaköy, Beyoğlu, Istanbul, Turkey.

Sankt Georg was founded in 1882 by Austrian Lazarists and was originally intended for German-speaking Catholic children living in the Ottoman Empire.

After the Ottoman (and Austrian) defeat in World War I, the school was ordered closed by the occupying Triple Entente forces in Istanbul, and all of its staff was sent back to Austria.

Alumni of Sankt Georg gather every year in the last week of April at a re-union called "Strudeltag".

Another annual re-union is organised around May in Vienna, which is intended for the graduates of Sankt Georg living/studying in Austria or in other European countries.