As of right now, there is no official word on whether or not a third Ted movie is in the works. However, that hasn't stopped fans from speculating about the possibility of a third film.
The first Ted movie was released in 2012 and was a huge success, grossing over $550 million at the box office. The sequel, Ted 2, was released in 2015 and while it didn't perform quite as well as the first film, it still did well enough to warrant speculation about a third film.
For now, we'll just have to wait and see if any official announcements are made about a potential Ted 3. In the meantime, you can always watch the first two movies to get your fix!