Kristiansen (Danish pronunciation: [kʰʁeˈstjænˀsn̩]) is a Danish and Norwegian patronymic surname that may refer to the following notable people:

• Celine Lundbye Kristiansen, Danish handball player
• Egil Kristiansen, Norwegian cross country skier
• Einar Kristiansen, Norwegian Nordic skiing athlete
• Einstein Kristiansen, Norwegian cartoonist, designer, TV-host
• Elin Kristiansen, Norwegian biathlete
• Erling Kristiansen (chess player), Norwegian chess master
• Fredrik Kristiansen, co-creator of the Blink online community
• Gro Marit Istad Kristiansen, Norwegian biathlete
• Henry Wilhelm Kristiansen, Norwegian newspaper editor and Communist Party politician (1902–1942)
• Ingrid Kristiansen, Norwegian long distance runner
• Jan Kristiansen, Danish footballer
• Jan Arne Kristiansen, rock musician with the band Raga Rockers
• Jeanett Kristiansen, Norwegian handball player
• John 'Tune' Kristiansen Danish soccer manager
• Kåre Kristiansen, Norwegian politician
• Kjartan Kristiansen, Norwegian rock musician
• Kjeld Kirk Kristiansen, Danish businessman, former CEO of LEGO (1979–2004)
• Lyle Kristiansen (1939–2015), Canadian politician from British Columbia
• Magne Kristiansen, American engineer
• Sven Erik Kristiansen, Norwegian musician known as "Maniac", a black metal musician
• Teddy Kristiansen, Danish comic book artist.