Cox was born to a British father and an Irish mother in Vienna. Her parents later divorced. Both of them are pianists, who originally came to Vienna on a grant for musicians. Cox grew up in Vienna and graduated from high school in 2003. She developed an interest in acting after performing in a play as part of her English classes during her final year in high school. After her graduation she went on to study acting at the Max Reinhardt Seminar. In 2008 she was under contract as a stage actor at the Theater in der Josefstadt in Vienna. In 2011 Cox moved to Berlin and since then she has appeared in various movies and series on German and Austrian TV, among them several Tatort movies. Since 2015 she plays the role of the viking woman Brida in the TV series The Last Kingdom, which made her known to international audiences.
Known For
The Physician II
Mercia
2025

Murder Mindfully
Katharina Diemel · (8 episodes)
2024

Constellation
Sara Schiller · (2 episodes)
2024

Unschuldig - Der Fall Julia B.
Julia Brandt
2023

Unsichtbarer Angreifer
Emma Turgut
2023

37 Sekunden
Clara Andersen · (6 episodes)
2023

Alma and Oskar
Alma Mahler
2023

Kleine Eheverbrechen
Lisa Sobiri
2023

The Last Kingdom: Seven Kings Must Die
Brida
2023

Steirerstern
Jana Skoff
2022

The Salvation Of The World As We Know It
Katharina
2021

Hartwig Seeler – Ein neues Leben
Tascha
2021

Blind ermittelt: Zerstörte Träume
Therese Maxeiner
2020

Kurzstrecke mit Pierre M. Krause
(1 episode)
2020

Danowski - Blutapfel
Meta Jurkschat
2019

The Accidental Rebel
Lilly
2019

Head Full of Honey
Nursing Home Manager
2018

Wuff
Ella
2018

What Have We Done to Deserve This?
Therapist
2018

Nichts zu verlieren
Miriam
2018

Labaule & Erben
(6 episodes)
2018

jerks.
Self · (31 episodes)
2017

Jesus Cries
Magdalena
2015

The Last Kingdom
Brida · (46 episodes)
2015

Wer weiß denn sowas?
Self · (1 episode)
2015

Shades of Guilt
Ulrike Gronau · (1 episode)
2015

Die Freischwimmerin
Martha Müller
2014

Zorn
Frieda Borck (Folge 1) · (5 episodes)
2014

Futuro Beach
Nanna
2014

Paul Kemp - Alles kein Problem
Manuela · (1 episode)
2013

CopStories
Sonja Omminger · (1 episode)
2013

Stille
Mel
2013

The Dead and the Living
Agnes, junge Frau in Auschwitz
2012

A Royal Affair
Caroline Mathilde
2012

Born to Dance
Milena 'Milli' Neubert
2011

How to Live Your Life
Laura
2011

The Fatherless
Mizzi
2011
Molly & Mops - Ein Mops kommt selten allein
Kellnerin
2011

Rammbock: Berlin Undead
Anita
2010

Der Täter
Jakobs Tochter Mascha
2010

Killerjagd - Schrei wenn du dich traust
Maja Hönow
2010

SOKO Stuttgart
Lucie Thieme · (1 episode)
2009
Dutschke
Gretchen Dutschke-Klotz
2009

The Vicar's Wife
Deirdre Lawless

Schnell ermittelt
Diana Weininger · (1 episode)
2009

Vienna Crime Squad
Judith Stoll · (1 episode)
2005
ZIBB
Self · (1 episode)
2003

Kommissarin Lucas
Jeanette Wilson · (1 episode)
2003

SOKO Kitzbühel
Gina Prinz · (1 episode)
2001

SOKO Leipzig
Hannah Falck · (1 episode)
2001

A Case For Two
Edith Egger · (1 episode)
1981

Polizeiruf 110
Heike · (1 episode)
1971

Scene of the Crime
Miranda Kador · (1 episode)
1970

Scene of the Crime
Roswita Mader · (1 episode)
1970

Scene of the Crime
Sybille Wildering · (1 episode)
1970