The Secret Room is a location in Valka Castle in Endless Ocean 2. As its name suggests, it is a secret room in the King's Chamber, with its only entrance being a secret door hidden behind an otherwise nondescript bookshelf.

One of the Okeanos Tablets can be found in here during the main storyline, as well as several other treasures and a few different species of sea creature, including Samurai Squirrelfish and Luminescent Sea Slugs.