von Firmian may refer to:

• Karl Joseph von Firmian (1716–1782), Austrian noble, Plenipotentiary of Lombardy to the Austrio-Hungarian Empire
• Leopold Anton von Firmian (1679–1744), Bishop of Lavant, Bishop of Seckau and Prince-Archbishop of Salzburg
• Leopold Ernst von Firmian (1708–1783), Austrian bishop and cardinal
• Leopold Maximilian von Firmian (1766–1831), Bishop of Lavant, Archbishop of Salzburg

• Nick de Firmian (born 1957), American chess player and Grandmaster
• Firman
• Firmiana
• Firmin