Inujima (犬島, literally: "dog island") is a small island off Okayama in the Seto Inland Sea that is named after a large rock resembling a sitting dog. Like nearby Naoshima Island, Inujima has become known as a site for modern art in recent years and serves as a venue of the Setouchi Triennale modern art festival. Due to its small size, the peaceful island can be explored entirely on foot.

Before turning to modern art, Inujima was mostly an industrial site. During the feudal age it produced granite blocks for castle construction, and in the early 20th century a copper refinery was supposed to bring prosperity and people to the island. However, copper prices plummeted within ten years of the refinery's opening and led to its premature closure and a drop in the island's population.

The refinery was not demolished after its closure, and despite being out of business for almost a century, its ruins still characterize Inujima's landscape. Designated as a "heritage of industrial modernization", the ruins with their exposed brick walls, overgrown power plant and crumbling smokestacks can now be explored by tourists.

In 2008, the refinery ruins were converted into the Inujima Seirensho Art Museum ("seirensho" is Japanese for "refinery") by tastefully incorporating an art gallery into the ruins. The gallery is located mostly underground and uses local materials such as granite and discarded bricks from the refinery. Among the small number of artworks on display are an intriguing tunnel of mirrors and a tribute to the late novelist Mishima Yukio, which consists of pieces of Mishima's former residence suspended in midair.

Admission tickets to the art museum are purchased at a Inujima Ticket Center next to the ferry terminal, a 200 meter walk from the refinery's gates. While in the past it was necessary to make advance reservations for a guided tour of the site, it is now possible to explore it on an individual basis without prior appointment. Setouchi Triennale passport holders simply proceed to the gates of the museum.

The rest of Inujima is occupied by a small rural village, which is home to about one hundred people. Scattered across the small, peaceful village are the five galleries of the Inujima Art House Project which were built for the art festivals of 2010 and 2013 and have become permanent attractions. They are explored in a pleasant 1-2 hour walk through the narrow lanes of the village.

Dining, shopping and lodging options are highly limited on the island. A couple of small restaurants are found in the proximity of the port, including a cafe inside the Inujima Ticket Center. The Seirensho Art Museum also has a cafe on its grounds, but outside of summer it is sometimes closed even when the museum is open. A beach with campground is found on the opposite side of the island, about a ten minute walk from the ferry terminal.