In astronomy, a blueshift is a decrease in electromagnetic wavelength caused by the motion of a celestial object toward an observer.
Blueshift or blue shift may also refer to:
- "Blue Shift", a song by Hawkwind from their 1993 album Electric Tepee
- "Blue Shift" (short story), a science fiction short story by Stephen Baxter
- Blueshifting, an Information Technology term defined in Redshift (theory)
- Half-Life: Blue Shift, a computer game
- Hypsochromic shift, a change in spectral band position to a shorter measured wavelength also called a blue shift