Blue Sky may refer to:

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Science

• Diffuse sky radiation, which causes the sky to appear blue

Art

• Blue Sky (artist), an American painter and sculptor formerly known as Warren Edward Johnson

Business

• Blue sky law, state laws in the United States that regulate the offering and sale of securities to protect the public from securities fraud
• Blue Sky Beverage Company, a soft drink manufacturer

Film and television

• Blue Sky (film), a 1994 film starring Jessica Lange and Tommy Lee Jones
• Blue Sky Studios, an Academy Award-winning computer animation studio

Music

• Mr. Blue Sky, a song by Electric Light Orchestra from their album Out of the Blue .
• Blue Sky (song), a song by The Allman Brothers Band from their 1972 album Eat a Peach
• Goodbye Blue Sky, a song by Pink Floyd on their album The Wall

Software

• Blue Sky Software, a defunct video game company
• Looking Glass Studios, a computer game developer originally known as Blue Sky Productions
• BlueSky Open Platform, an open source e-learning solution

Other

• BlueSky Charter School, an online school for Minnesota citizens
• Blue Sky navigation pod, airborne navigational/attack pod
• A Piece of Blue Sky
• Blue sky memo