Abstract: An interlocking stadium seating system comprising one-piece molded plastic seating modules having tab and blind rabbets for interlocking adjacent modules when placed in a side-by-side relationship in rows. The seat modules are secured to the common supporting structure by fasteners passing through openings that are disposed through the tabs and blind rabbets. This mean of attachment allows the entire surface of the seat module be used for sitting purpose. Additionally, the openings include sufficient play to allow rotational and translational movement between adjacent interlocked modules thereby enabling the seat modules to be placed in a straight line or at slight angle for adaptation to the existing architecture of the stadium.