Nightworld may refer to:

• Nightworld (novel), the sixth and final volume in a series of novels known as The Adversary Cycle by F. Paul Wilson
• Nightworld (film), a 2017 film directed by Patricio Valladares
• Lost Souls, a 1998 television drama-thriller film on UPN
• 30 Years to Life, a 1998 television film directed by Michael Tuchner

• Mr. Saturday Nite
• Mrs. A. W. Gridley House
• Mr. Saxobeat
• Mr. Sayyed Mohammad Beheshti
• Mrs Barthélemon
• Mrs Bass
• Mrs. Baylock
• Mrs. Beautiful
• Mrs. Bee
• Mrs Beeton's Household Management
• Mrs. Belloc Lowndes
• Mrs. Benson's Brush-warbler
• Mrs. Betty Slocombe
• Mrs. Bill Clinton
• Mrs Bill Clinton
• Mrs Birtles (Coronation Street)
• Mrs. Bixby and the Colonel's Coat
• Mrs Bixby and the Colonel's Coat
• Mrs Blobby
• Mrs Bloomsbury-Barton
• Mrs. Boutel
• Mrs Boutel
• Mrs Bracegirdle's Woodlyn Park Adventure
• Mrs Bradley
• Mrs Bridges