Khan reportedly worked on outlines for scripts about Diana's relationship with Dodi Fayed - who died in the same crash - and her infamous Panorama interview, but she ultimately felt Netflix didn't want to deal with the princess' story as "respectfully or compassionately" as she had hoped.
She said: "We worked together on the outline and scripts from September 2020 until February 2021.
"When our co-writing agreement was not honoured, and when I realised that particular storyline would not necessarily be told as respectfully or compassionately as I had hoped, I requested that all my contributions be removed from the series and I declined a credit."
A spokesperson for the show insisted Khan had "never been contracted" as a writer on the programme, but had merely helped producers with their research.
They told the Sunday Times newspaper: "Jemima Khan has been a friend, fan and a vocal public supporter of The Crown since season one.
"She has been part of a wide network of well-informed and varied sources who have provided extensive background information to our writers and research team — providing context for the drama that is The Crown. She has never been contracted as a writer on the series."