Abstract: A cutting and fillet board with drain is adapted for removable attachment to a conventional IGLOO® ice chest cooler and other similar ice chest coolers. The cutting and fillet board has a planar, generally rectangular board member fabricated of a high-density polymer and includes a raised peripheral wall. The board member has a generally smooth filleting surface designed for use during cutting, cleaning, and filleting fish. An attachment means facilitates removable attachment of the board member to an upper surface of an ice chest cooler top. A pair of drainage portals facilitate drainage from the filleting surface, while drain plugs serve to prevent drainage onto the ice chest cooler top. A cutting instrument retention means provides for temporary storage of a desired cutting instrument.