Fort de Port-Man, Military fort in Port-Cros Island, France.

Fort de Port-Man is a coastal defense structure on Port-Cros Island with a distinctive cylindrical stone tower. The tower contains three levels with two barrel-vaulted chambers below and an open gun platform on top for surveying the surrounding waters.

Cardinal Richelieu ordered construction between 1635 and 1637 to defend against Spanish naval threats in the Mediterranean. The structure was part of a broader defensive network protecting French territory during this period of maritime conflict.

The fort's name comes from Port-Man, the cove on Port-Cros's northeastern tip where it stands; "man" is not a French word for mother. The site is a listed monument historique inscrit, and since 2003 the photographer Yann Arthus-Bertrand has held it under a state concession for restoration. Visitors reach it on foot along the island's coastal paths.

The structure sits within Port-Cros National Park with limited visiting hours, primarily during Heritage Days and by scheduled guided tours. Access requires a boat trip to the island, so plan accordingly as the site has restricted opening times.

Renowned aerial photographer Yann Arthus-Bertrand took responsibility for restoration and maintenance starting in 2003. This connection between contemporary photography and historic preservation reflects an unconventional partnership in protecting the site.