The Danube Dragons founded in 1985 (until 1999 as Klosterneuburg Mercenaries) are a 3-time AFL-champion American football club based in Vienna, Austria.

Under the name Klosterneuburg Mercenaries the Dragons were among the first American football teams in Austria and ascended up to the Austrian Football League, the highest league in Austria.

They have moved from Klosterneuburg into Korneuburg in 2008, and into Vienna in 2012 (playing in FC Stadlau field).

In 2010 they won the Austrian Bowl XXVI defeating the Swarco Raiders Tirol in the final.

In 2022, the Dragons won the Austrian Bowl defeating the Vienna Vikings 51–29.