The HBO series usually premieres in April but, bosses said that due to the storyline, the seventh season air date would be pushed back.
Showrunners David Benioff and Dan Weiss previously explained: "We don't have an air date yet, but this year will probably be a little bit later.
"We're starting a bit later because at the end of this season, 'Winter is here' – and that means sunny weather doesn't really serve our purpose any more.
"So we kind of pushed everything down the line, so we could get some grim grey weather even in the sunnier places that we shoot."
Game of Thrones season 7 air date 'leaked'
An eagle-eyed Game of Thrones fan spotted the air date on IMDb
Game of Thrones season 7 predictions
Wed, October 26, 2016
Using clues and hints scraped together from George R.R. Martin’s original A Song of Ice and Fire novels and the TV show, along with a healthy dose of speculation, here are our predictions for season seven.
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Daenerys and Jon Snow unite – The revelation that Jon's father was Rhaegar Targaryen could also potentially unite the siblings in the battle between ice and fire
But, fans will be rejoicing as it seems IMDb have reportedly leaked the premiere date for season seven and, it's not too far away.
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According to the site, the first instalment of the new series of Game of Thrones will air on HBO on June 25.
News of the season premiere was spotted by an eagle-eyed fan and the information has now been deleted from the website.
Showrunners previously revealed that the final two instalments would be much shorter than usual but now the actor has hinted that some episodes could run over the usual one-hour time slot.
The season six finale saw Arya Stark kill her uncle Walder Frey
Iain hinted that season seven could be longer than expected
He teased: "They are taking the length of time it takes to shoot ten episodes to shoot just seven this year and six next year.
"There are fifteen more hours left in Thrones as we understand it, but that may change, but that's as far as we know."
Iain continued: "I think the scale and size of the set pieces, the world that is being created it's just getting more and more extraordinary and they feel they need that time to shoot seven hours as opposed to ten."
Game of Thrones is set to return later this year.