Stefan

 has several meanings pertinent to the Doctor Who universe and the real world. They are listed below in alphabetical order by surname. If no surname is available, alphabetization occurs by the disambiguation term — that is, the bit between the parentheses in a title like Waitress (Vincent and the Doctor).

As only name

 * Stefan (Divided Loyalties) (PROSE: Divided Loyalties)
 * Stefan (Lorna's Escape) (PROSE: Lorna's Escape)
 * Stefan (The Nightmare Fair) (PROSE: The Nightmare Fair / AUDIO: The Nightmare Fair)
 * Stefan (Plague of the Cybermen) (PROSE: Plague of the Cybermen)

As first name

 * Stefan Lessak, brother of Erina (PROSE: 42 Prologue)
 * Stefan Vargeld (PROSE: The Fall of Yquatine)

Guest

 * Stefan Davis, who played a Kitchen hand in TV: Voyage of the Damned
 * Stefan Schwartz, who played the Knight Commander in TV: Battlefield

Vocal

 * Stefan Atkinson, who voiced Pepin VII in AUDIO: The Holy Terror

Prose

 * Stefan Petrucha, who wrote PROSE: The Tunnel at the End of the Light