A seat suspension for boats and other vehicles having a seat support, a base and a suspension assembly positioned between the seat support and the base and permits relative movement between the seat support and the base. The suspension assembly has a first fluid container, a second fluid container, and an orifice member positioned between the first and second fluid containers. The orifice member includes a first orifice in fluid communication with the first and second fluid containers. A piston is positioned within the second fluid container and movable by fluid flowing through the first orifice.