Blue star or bluestar may refer to:

  • O-type star (a.k.a. blue star), a stellar classification

Animals

  • Linckia laevigata, a sea star from the Indian and West Pacific Oceans
  • Phataria unifascialis, a sea star from the East Pacific

Businesses

  • Blue Star (company), an Indian Air conditioning company
  • Blue Star Donuts, an American chain of gourmet donut shops
  • Blue Star Ferries, a Greek ferry company
  • Blue Star Infotech, Indian company
  • Blue Star Line, a former British shipping company
  • Blue Star Productions, a publishing imprint and a division of Book World, Inc
  • Bluestar (bus company), based in Southampton, England
  • Blue star (Indonesian bus company), based in Salatiga, Central Java, Indonesia
  • Bluestar Company, a predecessor of ChemChina

Military

  • Operation Blue Star, a 1984 Indian military operation
  • Blue stars used on service flags denote a United States service member fighting in a war
  • Blue Star Memorial Highway, a system of highway markers honoring veterans
  • Blue Star Mothers Club, a non-profit military support group

Music

  • "Blue Star" (song), first recorded 1955
  • Blue Star, an album by Levinhurst

Plants

  • Amsonia, plant species also named "bluestar"
  • Hubricht's Bluestar (Amsonia hubrichtii), plant
  • Isotoma axillaris

Others

  • The Blue Star (novel), a 1952 fantasy novel by Fletcher Pratt
  • The Blue Star (film), a 2023 Spanish-Argentine drama film
  • Newcastle Blue Star F.C., English association football team
  • Blue star, the logo of Newcastle Brown Ale
  • BlueStar PR, Jewish political organization
  • Tesla BlueStar, code name for the Tesla Model 3 electric car
  • Blue Star Wicca, a sect of traditionalist witches
  • Blue Star, a nickname for the United States business band frequency of 467.925 MHz
  • Blue Star (SLV), satellite launcher
  • Blue star tattoo legend
  • Blue Star, a type of Multiple working system used on British locomotives
  • Blue Star Kachina, a legendary spirit
  • Blue Star (film), a 2024 Tamil sports film

See also

  • Blue Stars (disambiguation)
  • Blue (disambiguation)
  • Star (disambiguation)
  • Blue giant (disambiguation)
  • Blue main-sequence star (disambiguation)
  • Blue dwarf (disambiguation)
  • Blue subdwarf (disambiguation)
  • Blue Planet (disambiguation)
  • Blue world (disambiguation)