Black sky or variation, may refer to:
- night sky, when the sky is black instead of blue
- outer space, whose sky is black instead of blue
- Black Sky (Spanish: Cielo negro), a 1951 Spanish drama film
- Black Sky: The Race For Space (2004), a Peabody Award winning Discovery Channel documentary telefilm about the Ansari X-Prize and SpaceShipOne
- BlackSky, a division of Spaceflight Industries Inc. providing geospatial intelligence services
- "Black Sky", a 1992 song by Shakespears Sister from the album Hormonally Yours