Abstract: A hydrofoil and hydrofoil system for a surfboard is disclosed. The surfboard has a planar hull defined by a top surface, a bottom surface, a nose, a tail, and opposing side rails extending from the nose to the tail and that define a transition from the top surface to the bottom surface. The hydrofoil system includes one or more attachment mechanisms mounted with the planar hull at or proximate to at least one of the opposing side rails of the planar hull, each of the one or more attachment mechanisms comprising an attachment site oriented substantially laterally from the planar hull. The hydrofoil system further includes a hydrofoil configured to attach to the attachment site of one of the one or more attachment mechanisms, the hydrofoil further being configured to extend substantially laterally from the planar hull at or proximate to the at least one of the opposing side rails of the planar hull.