Doug

In-universe

 * Doug, a student at UC Sunnydale.
 * Doug, a demon.
 * Doug Jeffries, a Sunnydale High School student.
 * Doug Perren, an archaeologist and curator at the Sunnydale Natural History Museum.
 * Doug Sanders, a vampire and the author of Selective Slaughter.

Real world

 * Doug Jones, an actor who portrayed a Gentlemen in episode "Hush".
 * Douglas "Doug" Petrie, a co-executive producer, writer, and director for Buffy and Angel.
 * Douglas Romayne, a composer for Buffy the Vampire Slayer and Angel.