Goodnight Sweetheart may refer to:

• "Goodnite, Sweetheart, Goodnite", a 1954 song written by Calvin Carter and James "Pookie" Hudson
• Goodnight Sweetheart (TV series), a 1990s British sitcom
• Goodnight, Sweetheart (film), a 1944 American comedy film
• Goodnight Sweetheart (album), a 1996 album by David Kersh
• "Goodnight Sweetheart" (Ray Noble, Jimmy Campbell and Reg Connelly song), a 1931 song written by Ray Noble, Jimmy Campbell, and Reg Connelly
• "Goodnight Sweetheart" (Joe Diffie song), 1992, also covered by David Kersh
• "Goodnight Sweetheart", a 1978 song by Frankie Miller from Double Trouble
• "Goodnight Sweetheart" (All Saints), an episode of All Saints

• Undercover Law
• Undercover Man (1936 film)
• Undercover (OSS training film)
• Undercover Policing Inquiry
• Undercover Prodigy
• Undercover (Shinee song)
• Undercover (Susanne Sundfør song)
• Undercover (The Infamous Stringdusters EP)
• Undercover with the KKK
• Undercrackers
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• Undercurrent (company)
• Undercurrent (Matisyahu album)
• Undercurrent (Sarah Jarosz album)
• Undercurrents (TV series)
• Undercut procedure
• Undercutting
• Under Cöver
• Underdog (2018 film)
• Underdog (Banks song)
• Underdog (film)
• Underdog Knight 2
• Underdog (Lil Baby and Gunna song)
• Underdog Records
• Underdogs (2013 animated film)