List of actors reprising their roles at Big Finish

This is a list of actors who have reprised their roles from televised Doctor Who or one of its spin-offs in Big Finish Productions audio stories.

Ralph Watson as Captain Knight holds the record for the longest time between debut on television and reprisal of the role at Big Finish. The character's debut in the first part of The Web of Fear in 1968 and return in The Web of Time in 2019 for The Diary of River Song: Series Six were separated by over fifty-one years.

In contrast, David Bradley as the First Doctor holds the record for the shortest time between debut and reprisal. In 2013, Bradley played William Hartnell in An Adventure in Space and Time but did not officially appear as the Doctor until the cliffhanger in the closing moments of The Doctor Falls on 1 July 2017. He appeared on audio on Christmas Day that year in The First Doctor Adventures: Volume One, the same day as his first full television appearance in Twice Upon a Time, less than six months after his television debut.

Recurring characters
Characters who have made appearances in one or more Doctor Who episode and one or more Big Finish audio.

One-off characters
Characters who appeared in only one episode of Doctor Who and one Big Finish audio story

Other information

 * Claudia Grant, Jamie Glover and Jemma Powell, who portrayed Carole Ann Ford, William Russell and Jacqueline Hill in An Adventure in Space and Time, voiced Susan Foreman, Ian Chesterton and Barbara Wright in The First Doctor Adventures and The Diary of River Song: Series Six with David Bradley as the Doctor. Powell also voiced Barbara in The Early Adventures opposite William Russell, Carole Ann Ford and Maureen O'Brien.
 * Jackie Lane, who played Dodo Chaplet, was the only Classic Who companion to not reprise her role for Big Finish since Doctor Who audios started in 1999. As of her death in 2021, actress Lauren Cornelius has been playing the role of Dodo.
 * John Line played John Ladiver in the 1965 stage play The Curse of the Daleks and in 2008 returned to the production, portraying the older Professor Vanderlyn in the audio adaptation.
 * In 2003's Zagreus, archive audio of Jon Pertwee was used for a Third Doctor cameo in the story. Since 2013, the Third Doctor has been played by Tim Treloar.
 * Elisabeth Sladen voiced Sarah Jane Smith only in her own Big Finish spin-off from 2002-2006. A week before her death in 2011, she and Tom Baker had signed a contract to begin recording the first series of the Fourth Doctor Adventures. Since 2021 her daughter Sadie Miller has been playing the role of Sarah Jane.
 * Trevor Martin played the Doctor both in the 1974 stage play Doctor Who and the Daleks in Seven Keys to Doomsday and in the 2008 audio adaptation.
 * Anthony Ainley was invited to reprise the role of in 2001, but Big Finish were unable to reach a suitable deal with him.
 * Kate O'Mara was due to return as the Rani in 2014, but passed away a few weeks before recording began. Siobhan Redmond was cast as the new incarnation of the Rani.
 * Due to Fox owning the rights to Grace Holloway and Chang Lee from Doctor Who: The Movie, Daphne Ashbrook and Yee Jee Tso have been unable to reprise their roles of Grace and Chang for Big Finish, however have played multiple different roles for audios, most notably as Ruth Matheson and Charlie Sato respectively.
 * Noel Clarke, Karen Gillan, Jenna Coleman, Matt Lucas and Pearl Mackie have not yet returned to their roles of the Doctor's companions from the new series, although Clarke, Coleman and Lucas have played different roles or narrated audiobooks for other Big Finish stories. Clarke is not expected to reprise his role of Mickey Smith due to sexual misconduct allegations in 2021.
 * Nicholas Briggs is the only actor who reprised his role from Big Finish audio stories in the TV series, having voiced the Daleks, Cybermen, Judoon and Ice Warriors.
 * Nina Toussaint-White, who in Let's Kill Hitler played Mels Zucker, the second incarnation of River Song, also voiced the second incarnation of River's clone Brooke in The Diary of River Song: Series Three.