Slettheia is a district in the borough Vågsbygd in the city of Kristiansand in Agder county, Norway.

The district was the childhood home for Crown Princess Mette-Marit of Norway.

Public transportation is available with local city buses every day.

[2] Slettheia has about 4,000 residents (in 2014) and it is the district in Kristiansand with the highest percentage of immigrants in the city with about 36% of residents being immigrants.

Approximately 31% are from Africa and Asia while another 4% are from Europe and North-America.