Named after Kardinal-Nagl-Platz, which honours Franz Nagl, Archbishop of Vienna.
The square was named on 17 September 1914 after Cardinal Franz Nagl (1855–1913); it had been Thomasplatz. Born in Vienna, Nagl was Bishop of Trieste from 1902 and Prince-Archbishop of Vienna from 1911 until his death, becoming a cardinal in 1911. The high point of his short term was the International Eucharistic Congress held in Vienna in 1912.