Oceanopolis, Public aquarium in Brest, France.

Oceanopolis is a marine center in Brest, France, organized into three pavilions that recreate polar, temperate, and tropical aquatic environments. Each area presents species from different climate zones, accompanied by information panels and tanks that range from seafloor to surface habitats.

Marine biologists Éric Hussenot and Jean-Paul Alayse, both CNRS researchers, proposed an aquarium-museum for Brest in the early 1980s and persuaded mayor Pierre Maille to fund it. Work on "La Maison de la Mer", designed by architect Jacques Rougerie near the Moulin-Blanc marina, began in 1988; it opened on 21 June 1990 and was inaugurated on 26 June by minister Jacques Mellick. The polar and tropical pavilions were added in 2000, and a 34-million-euro "Métamorphose" renovation began in 2023.

The name combines "océan" and "polis", the Greek word for city. The first pavilion, opened in 1990, was designed by architect Jacques Rougerie with a shape recalling a crab, a nod to the marine world it presents. In 2023 the centre received a Victoire de la Bretagne award.

The site sits beside the Moulin-Blanc marina, and the entrance is reached through a new reception and ticket building with a shop and a tourist office. A footbridge links it to the Forum, and a curved outdoor ramp with a railing leads up to the upper level. The "Métamorphose" works begun in 2023, with reopening planned for summer 2026, may close some areas.

One of the tanks holds several shark species that visitors can watch up close while walking through a tunnel. The center also works with research facilities that gather data on animal behavior and life cycles.