She was a nationally ranked swimmer at Perth Modern School. She decided to study acting after graduating from the school.
She had only ten days to secure a work visa for the United States after being cast in 13 Reasons Why (2017).
She was born to Stephen and Elizabeth Langford in Perth, Australia. Both of her parents are doctors.
She had once planned on following her parents into medicine.
Katherine Langford was initially in Avengers: Endgame (2019). Her character was an older Morgan Stark, the daughter of Tony Stark / Iron Man ( Robert Downey Jr. ). However, the respective scene ended up not being added to the final version of the film (although it is available on Disney+ and for Home Video).