The International Trade Commission found that HTC had infringed on one of the US technology giant's patents.
Any HTC phones that infringe on the patent will be banned from sale in the US from April 19, 2012.
An administrative law judge at the commission had ruled in July that HTC infringed two Apple patents in making its Android smartphones.
Apple had initially accused HTC of infringing 10 patents, but six were dropped from the case.
Apple is embroiled in numerous patent disputes in many countries, most famously with Samsung.
The ITC is an agency that has the power to block the import of products into the United States that it believes violate patents.
