Merlin was often referred to as a warlock.
The exact definition of a warlock was never confirmed within the series. The most common theory is that it's a gender-specific term for a male sorcerer, just as witch is a gender-specific term for a female sorcerer.
However, it should be noted that Merlin is the only character actually referred to as a warlock within the series. Other male magic-users are referred to as sorcerers and Druids, but never as warlocks.
Another common theory is that a warlock is born with magic while a sorcerer studies it, which would explain why Merlin is the only character to be addressed as one. He is the only sorcerer in the series known to have been able to use magic instinctively from birth, and it has been implied that he's an anomaly in this regard (The Dragon's Call).
Confirmed Warlocks
| Warlock | Status | Known As | Photo | |
|---|---|---|---|---|
| Merlin | Alive |
|
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Unconfirmed Warlocks
| Warlock | Status | Known As | Photo |
|---|---|---|---|
| Gaius | Alive |
|
 |
| Edwin Muirden | † |
|
  |
| Mordred | † |
|
  |
| Iseldir | Alive |   | |
| Anhora | Alive |
|
  |
| Tauren | † |
|
  |
| Cornelius Sigan | † |
|
  |
| Aglain | † |
|
  |
| Trickler | Alive |
|
  |
| Alvarr | Alive |
|
  |
| Balinor | † |
|
  |
| Ghost Boy | † |
|
  |
| Taliesin | † |   | |
| Grettir | Alive |
|
  |
| Gilli | Alive |
|
  |
| Alator | † |   | |
| Druid Boy | † |
|
  |
| Ruadan | † |
|
  |
| Lochru | † |   | |
| Osgar | † |
|
  |
| Ari | Alive |
|
  |
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Trivia
- In some texts, the word "warlock" translates to "truth-twister". This is widely unknown due to modern usage of the word in works like Harry Potter, and clearly does not apply to Merlin, either.