Johann Georg Hiedler

In German history, Johann Georg Hiedler (28 September 1792, – 1857) was born to Martin Hiedler (17 November 1762 - 10 January 1829) and Anna Maria Goschl (August 23, 1760 - 7 December 1854). He was considered the officially accepted grandfather of Adolf Hitler by the Third Reich. Whether he was in fact Hitler's biological paternal grandfather is considered unknown by modern historians.

He made his living as a wandering journeyman miller. He married his first wife in 1824 but she died in childbirth five months later. In 1842, he married Maria Anna Schicklgruber and became the legal stepfather to her five year old son, Alois, an illegitimate child who it was later claimed Johann had fathered prior to his marriage to Schicklgruber. In 1876, almost twenty years after his death, Alois was legally declared to have been Johann Georg's son.

Accordingly, Johann Georg Hiedler is one of three people most cited by modern historians as having possibly been the actual grandfather of Adolf Hitler. The other two are Johann Nepomuk Hiedler, the younger brother of Johann Georg, and a Graz Jew by the name of Frankenberger.

In the 1950s, this third possibility was popular among historians, but modern historians now think it highly unlikely as the Jews were expelled from Graz in the fifteenth century and were not permitted to return until the 1860s, several decades after Alois' birth.