- Nik (Fear of the Dark)
- Nik (The Curse of Fenman)
- Nik Calvin
- Nik Faulkner
- Nik Howden
- Nik Romero
- Nik Yuen
- Nik Zaran
- Nike
- Nike Palmer
- Nikesh Patel
- Nikhol Vakarshta
- Niki (For the Girl Who Has Everything)
- Niki Haringsma
- Niki de Jong
- Nikita Bandranaik
- Nikita Bandranaik/Appearances
- Nikita Base
- Nikita Gill
- Nikita Khrushchev
- Nikita Mitchell
- Nikitin
- Nikki Amuka-Bird
- Nikki Beckford
- Nikki Bevan
- Nikki Davies
- Nikki Hunter
- Nikki Jupiter
- Nikki Lightfoot
- Nikki Wilson
- Nikkita Chadha
- Nikol
- Nikola Tesla
- Nikola Tesla's Night of Terror (TV story)
- Nikola Tesla's Night of Terror (game)
- Nikola Tesla's Night of Terror (short story)
- Nikola Tesla's Word Search of Wonder (game)
- Nikola Tesla's laboratory
- Nikola Tesla/Appearances
- Nikola Tesla (The Schizoid Earth)
- Nikolai Bulganin
- Nikolai Faro
- Nikolai Hermack
- Nikolai Lobachevsky
- Nikolai Sorin
- Nikon
- Nikos (Shakedown: Return of the Sontarans)
- Nikos Paladopous
- Nikos Spiridakis
- Niky Wardley