The Re-entry Permit (Form I-327) is a travel document similar to a certificate of identity, issued by the United States Citizenship and Immigration Services to U.S. lawful permanent residents to allow them to travel abroad and return to the United States.

Individuals whose application for permanent residency has not yet been approved can apply instead for advance parole (Form I-512).

The re-entry permit enables a lawful permanent resident (LPR) of the U.S. to travel outside the United States for time periods longer than one year and establishes that the LPR does not intend to abandon residence in the U.S. A re-entry permit prevents two problems: If a U.S. permanent resident intends to take a trip abroad for over one year, they may apply for a re-entry permit.

[4] As of 2013[update], most Schengen Area countries accept the U.S. Re-entry Permit for visa issuance purposes.

The Re-entry Permit is considered as an Alien's Travel Document.