Iger, whose contract was extended twice previously, telegraphed the move as possible last month in an earnings conference call.
Future leadership of Disney has been in focus since Iger's presumed successor Tom Staggs resigned last spring unexpectedly.
The job's demands include oversight of Disney's vast empire of entertainment and amusement park properties, as well as the challenge of how to best position the company as technology disrupts the entertainment business.
Disney lead director Orin Smith in a press release praised Iger, 66, as the best choice as "the Board conducts the robust process of identifying a successor and ensuring a smooth transition."
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Iger also has overseen the build out of Disney's amusement park business, including launch of a new Shanghai park last year.
A key challenge concerns future profitability for its ESPN sports network with the erosion of the traditional cable broadcast business due to competition from online and mobile options.
"Leading this great company is a tremendous privilege, and I am honored to have been asked to continue serving as CEO through July 2, 2019," Iger said in a statement.
Shares of Disney rose 0.8 percent to $112.93.
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