Alastair

 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 (Random Shoes).

In-universe

 * Alastair Fergus (DW: The Dæmons, MA: Who Killed Kennedy)

Actors

 * Alastair Cumming, who played Colin Frazer in DW: Arc of Infinity
 * Alastair Sill, who played a Young Dad in TW: From Out of the Rain

Vocal

 * Alastair Cording, who voiced Mors Alexandryn and a Guard in BFA: ''The Death Collectors

Production

 * Alastair Mackay, who was film editor for DW: The Green Death and Snakedance
 * Alastair Mitchell, who was film editor for several Doctor Who stories