Albrecht Johannes "Hans" Hayn (7 August 1896 – 30 June 1934) was a German officer in the Sturmabteilung (SA), the Nazi paramilitary organization, in which he attained the rank of SA-Gruppenführer.

A close associate of SA-Stabschef Ernst Röhm, he was murdered by members of the Leibstandarte SS Adolf Hitler during the Night of the Long Knives.

In 1921, he took part in the fighting in Third Silesian Uprising seeking to return Polish-inhabited territory to Germany as a member of the Selbstschutz militia and the Roßbach Freikorps.

Together with Albert Leo Schlageter, he carried out bomb attacks on French railways and military facilities as the leader of a sabotage squad.

Hayn was appointed chief of staff of the newly created SA-Gruppe Schlesien [de] and thus, after Heines, the second highest SA official in Silesia.

The previous leader, Hanns Günther von Obernitz [de], had fled to Italy to escape arrest for his involvement in a series of terrorist bomb attacks, and the post had fallen vacant.

On 1 July 1933, Hayn was appointed as the successor to SA-Gruppenführer Georg von Detten as Führer of the SA-Gruppe Sachsen, commanding all the SA units in the state of Saxony with his headquarters in Dresden.