Katarina Juli Naumanen (born 24 July 1995) is a Finnish footballer who plays as a defender.
On 6 April 2016, Naumanen was announced at HJK.
Naumanen won the 2018 Aalto Athlete of the Year award due to her ability to combine sports and studies.
On 30 November 2018, Naumanen was announced at Stabæk. She scored against ÃÂHIL in the 58th minute.
On 2 August 2019, Naumanen was announced at KuPS.
On 4 November 2019, Naumanen was announced at FC Honka.
On 19 November 2021, Naumanen was announced at HJK for the 2022 season. On 30 March 2022, it was announced that she would be focusing on rehabilitating her knee and would be focusing on a sales career.
In May 2022, Naumanen joined the Olympic Committee of Finland.
Naumanen was called up to the 2016 Cyprus Women's Cup.
Naumanen was called up to the 2018 Cyprus Women's Cup.
Naumanen was called up to the 2019 Cyprus Women's Cup. She scored her first international goal against South Africa on 6 March 2019, scoring in the 31st minute.
Whilst playing for Stabæk, Naumanen was played in the fullback position, but prefers to play as a winger.
Naumanen has dealt with mental health issues such as anxiety and depression. She wanted to speak out about it so other people would be able to. She also runs a podcast with Martin Paas called #Taloudentekijät. Naumanen has also written for a column about her everyday life as a football player.