Katrin Tanja Davidsdottir is an Icelandic CrossFit athlete known for her seven appearances at the CrossFit Games. She is the women's champion of the 2015 and 2016 CrossFit Games. Katrín is the second woman to repeat as champion, following in the footsteps of her countrywoman, Anníe Þórisdóttir.

• The Fittest (2020)

  
• The Redeemed and the Dominant: Fittest on Earth (2018)