Hellboy and it’s sequel are 2 of my favourite films, especially the first one. And while a third movie is unlikely from Guillermo Del Toro, Ron Perlman, Hellboy himself, is pushing on the notion with Del Toro. He spoke to Movieweb saying
"I've been giving Guillermo body shots for two years. We both walked away from Hellboy II agreeing that there would never be another one. But, with the passage of time, it became clear to me that he really always designed it as a trilogy. He has a very well-articulated idea of what the resolve would look like and it's amazingly theatrical and is epic in scope and would make for amazing cinema, with or without the first two movies. But there are so many questions posed in the first two films that absolutely need to be answered. I said, 'You owe it to the world to finish this trilogy.' I've been giving him Jewish guilt."
Del Toro isn’t opposed to the entire idea, as he said back in June 2011 that he wanted to make a third movie but due to scheduling it would be “Hellman in a wheelchair”I would say watch this space, but who knows how long you’ll be watching it. Still though, the idea of a third Hellboy movie hasn’t gone away, and that’s a good thing!