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, 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