Blue star
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 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
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 (album), is 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
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

See also
Blue Stars (disambiguation)
Blue (disambiguation)
Star (disambiguation)
Blue giant (disambiguation)
Blue dwarf (disambiguation)
Blue Planet (disambiguation)
Blue world (disambiguation)