Board Thread:Questions and Answers/@comment-82.43.161.67-20121211173806/@comment-140.182.177.173-20121211213147

No, or it least it hasn't been explicitly told so in the writing. I wouldn't be surprised though if Merlin reveals his magic and it turns out Gwaine had already known or at least had a hunch. I always thought he should be the next one of Merlin's friends to find out after Lancelot died.