Special Agent Diana Thomas is the secondary protagonist in the fourth season of Sleepy Hollow, who replaced the late Abbie Mills as Ichabod Crane's new partner.

She is a Homeland Security Agent that works in Washington D.C. along with her partner, Eric Cortez. After a demon killed her partner, she began working with Ichabod Crane to hunt down the creature that killed her partner and many other civillians. She is the mother of Molly/Lara Thomas, who was revealed to be the new Witnesses as well as the Oracle.