Joanna Trollope has been appointed as a trustee of the National Literary Trust, joining other industry figures including Random House chair and chief executive Gail Rebuck.
Director of the National Literacy Trust Jonathan Douglas said Trollope was "a long-standing champion of literacy" and praised "her passion for literacy and reading and her sense of fun".
He said: "We hope her expertise and profile will help us continue to raise the issue of poor literacy in the UK."
Trollope said: "Poor literacy skills can blight a life—especially a young life—to the same degree that poor health can. I am a huge admirer of the National Literary Trust's aims and achievements, and it's a privilege to be made a trustee of this impressive organisation."
Trollope has been supportive of the charity for several years and became an author ambassador for its 20th anniversary this year.