Blu or BLU may refer to:
Bluetooth is a wireless technology standard for exchanging data over short distances (using short-wavelength UHF radio waves in the ISM band from 2.4 to 2.485 GHz) from fixed and mobile devices, and building personal area networks (PANs).
Blu-ray or Blu-ray Disc (BD) is a digital optical disc data storage format. It was designed to supersede the DVD format, in that it is capable of storing high-definition (720p and 1080p) and ultra high-definition video resolution (2160p).
The blue whale (Balaenoptera musculus) is a marine mammal belonging to the baleen whales (Mysticeti). At up to 30 metres (98 ft) in length and with a maximum recorded weight of 173 tonnes (191 short tons) and probably reaching over 181 tonnes (200 short tons), it is the largest animal known to have ever existed.
Blue is the colour between violet and green on the optical spectrum of visible light. Human eyes perceive blue when observing light with a wavelength between 450 and 495 nanometres, which is between 4500 and 4950 ångströms.
Blue Is the Warmest Colour (French: La Vie d'Adèle – Chapitres 1 & 2 – "The Life of Adèle – Chapters 1 & 2") is a 2013 French coming-of-age erotic romantic drama film co-written, co-produced, and directed by Abdellatif Kechiche, starring Adèle Exarchopoulos and Léa Seydoux.
Blues is a genre and musical form originated by African Americans in the Deep South of the United States around the end of the 19th century.
The Blue Dog Coalition, commonly known as the Blue Dogs or Blue Dog Democrats, is a caucus of United States Congressional Representatives from the Democratic Party who identify as conservative Democrats.
Blue Öyster Cult (often abbreviated BÖC) is an American rock band formed on Long Island, New York in 1967, whose most successful work includes the hard rock and heavy metal songs "(Don't Fear) The Reaper", "Godzilla" and "Burnin' for You".
Blue Origin is an American privately-funded aerospace manufacturer and spaceflight services company set up by Amazon.com founder Jeff Bezos with its headquarters in Kent, Washington.