The Huahine swamphen (Porphyrio mcnabi) was a species of bird in the family Rallidae.

It was a small swamphen endemic to Huahine in the Society Islands of French Polynesia.

It is known only from subfossil remains found at the Fa'ahia archaeological site on the island.

The swamphen is only one of a suite of birds found at the site which became extinct either locally or globally following human occupation of the island.

The species was named after Brian K. McNab to recognise his research on the evolution and ecology of flightless birds, especially rails, on oceanic islands.