Portsmouth is a neighborhood in the north section of Portland, Oregon, United States.

This association referred to the subdivision as the "City of Portsmouth", although a proper municipality was never established.

The location is near the lower end of the Portland harbor, and perhaps they felt the word was therefore suitable.

A large portion of the neighborhood is occupied by New Columbia, an 82-acre (33 ha) mixed-income housing development.

The Peninsula Crossing Trail runs along the neighborhood's western boundary.