Three ships of the United States Navy have borne the name USS Portland, named in honor of the cities of Portland, Maine, and Portland, Oregon.

• USS Portland (CA-33) was a Portland-class heavy cruiser, launched in 1932 and struck in 1959
• USS Portland (LSD-37) was an Anchorage-class dock landing ship, launched in 1969 and struck in 2004
• USS Portland (LPD-27) is a San Antonio-class amphibious transport dock launched 13 February 2016

• HMS Portland

This article includes a list of ships with the same or similar names. If an internal link for a specific ship led you here, you may wish to change the link to point directly to the intended ship article, if one exists.