The free ITV Player app, which is supported by advertising, gives users access to seven days worth of programmes from ITV1, ITV2, ITV3 and ITV4, including Coronation Street, Popstar to Operastar and Celebrity Juice. Video playback using the app is Wi-Fi only, meaning there is no 3G streaming.
The launch on Apple's iOS operating system follows the arrival of ITV Player on mobile handsets running Google Android last week, and is part of ITV's ambitious digital expansion plans.
Robin Pembrooke, the managing director of ITV Online and On-Demand, said: "I'm genuinely thrilled to be launching our ITV Player app across the Apple family of devices just in time for our customers to be able to catch up on what promises to be some amazing performances at this year's iTunes Festival on ITV.
"This launch is a key moment in our mobile delivery strategy and we're very proud that a simple, user friendly and quality ITV Player experience is now available across a range of mobile devices."
Last December, ITV Player launched on Sony's PlayStation 3 console, joining fellow catch-up services BBC iPlayer and Channel 4's 4oD.