Shellshock or shell shock may refer to:

• Shell shock, a term coined to describe the reaction of some soldiers in World War I, or any war, to the trauma of battle

• M&M's: Shell Shocked, a video game
• Shellshock: Nam '67, a 2004 video game
• Shellshock (video game)
• ShellShock Live, a 2015 artillery video game

• Shell Shocked (album), a 1998 album by Mac
• Shell Shock (band), a metal band from New Orleans
• Shell Shock (opera), a 2014 opera by Nicholas Lens

• "Shellshock" (song), by New Order
• "Shellshock", by Die Krupps on the album Rings of Steel
• "Shellshock", by Love Battery on the album Between the Eyes
• "Shell Shock", by Heart on the album Heart
• "Shell Shock", by Manowar on the album Battle Hymns
• "Shellshock", by Tank from album Filth Hounds of Hades
• "Shellshock", by Tank feat. Dani Filth from album Re-Ignition
• "Shell Shock", by Gym Class Heroes from soundtrack album Teenage Mutant Ninja Turtles: Music from the Motion Picture
• "Shell Shocked" (song), a song by Juicy J, Wiz Khalifa and Ty Dolla Sign
• "Shellshock", by Sad Café, 1977
• "Shellshock", by Onslaught, 1989

• Shellshock (Marvel Comics), a Marvel Comics character
• Shellshock (software bug), a security hole in the Bash computer shell
• Shellshock (wildlife protection organisation), formed to protect tortoises and turtles
• Shell Shock (film), a 1964 movie
• Shell Shock (novella), a Doctor Who novella
• "Shell Shock", a season 2 episode of The Loud House
• "Shell Shocked" (SpongeBob SquarePants), an episode of SpongeBob SquarePants
• Teenage Mutant Ninja Turtles Shell Shock, an amusement ride at Nickelodeon Universe
• Shell Shock (Part I) and Shell Shock (Part II), a two-part episode in season 10 of NCIS