The broadcaster already airs an HD channel on Freesat but has managed to lease bandwidth the the BBC in order to make a channel on Freeview viable.
ITV1 HD should be available in some areas by December. However, HD-ready set-top boxes are not expected to be widely available until next year.
Freeview is set to announce details of its three-year plan to roll out HD next month. ITV agreed to launch a HD channel in 2007 but delayed an official announcement because of financial issues.
Freeview expects that 50% of UK households will be able to receive ITV1 HD in time for the football World Cup in South Africa next June.
ITV has not managed to reach a deal with BSkyB to launch a HD service on the digital satellite broadcaster's service.
The BBC is launching a Freeview HD service later this year.
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