Blue Danube may refer to:

• The Blue Danube, a waltz composed by Johann Strauss II
• The Blue Danube (1926 film), a German silent film directed by Frederic Zelnik
• The Blue Danube (1928 film), an American silent film starring Leatrice Joy
• The Blue Danube (1932 film), a 1932 British film
• The Blue Danube (1939 film), an American animation film by MGM
• Blue Danube (nuclear weapon), the first British operational nuclear weapon
• Blue Danube (band), an Austrian band who represented their country in the 1980 Eurovision Song Contest
• Blue Danube Radio, an English-language radio station in Vienna
• Blue Danube, or Blue Onion, a porcelain pattern
• Blue Danube (album)

• Acetobacter
• Acetobacteraceae
• Acetobacteria
• Ace-to-five low
• Acetogen
• Acetoin
• Acetominophen
• Aceton
• Acetone
• Acetone Breath
• Acetone (data page)
• Acetone peroxide
• Acetone Peroxide
• Acetonitrile
• Acetophenone
• Ace-to-six low
• ACE train
• Ace Troubleshooter
• Ace Troubleshooter (album)
• Ace Trucking Co.
• Acetylacetone
• Acetylandromedol
• Acetylation
• Acetyl chloride
• Acetylcholine