The event, which this year will take place in Cologne, Germany, between August 21 and 25, was missing both Microsoft and Nintendo last year as the companies chose to pursue other marketing routes.
Gamescom project manager at Koelnmesse Tim Endres said, "Nintendo's return is an absolute highlight for our community, exhibitors and trade visitors from around the world."
While there's nothing concrete on whether or not Microsoft will also return, Endres did add that other major firms are currently in talks about attendance, so it's a real possibility. Considering the company's big rival, Sony, is almost guaranteed to be there and with a new console in tow, it's not really an opportunity Microsoft can pass up.
Other publishers confirmed to be in attendance at Gamescom 2013 include Bethesda Softworks, Bigpoint, Deep Silver/Koch Media, Electronic Arts, Konami, NCsoft, Riot Games, Ubisoft, Wargaming and Warner Bros.