No formal explanation was give when the company announced its decision on its website late Sunday.
It had been reported earlier that the new device, iPad's third version since 2010, would be available in stores on Friday, March 16.
Asked about the reasons for the postponement, Apple did not respond immediately.
The new iPad boasts a more powerful processor, eye-grabbing resolution on par with that of an iPhone 4S, and the ability to connect to the latest 4G LTE telecom networks that move data faster than their predecessors.
It is due to be released simultaneously in 10 countries: the United States, France, Canada, Australia, Germany, Japan, Singapore, Switzerland, the United Kingdom and China.
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