The Pontiac Sunbird (also known as the Pontiac J2000 and Pontiac 2000) is a model line that was manufactured and marketed by Pontiac from the 1976 to the 1994 model years. Loosely deriving its name from the Pontiac Firebird, the Sunbird was introduced as the eventual replacement for the Pontiac Astre, replacing it entirely in 1978 as the smallest Pontiac (the later T1000 was slotted below it in size).

The first generation of the Sunbird used the subcompact GM H platform. Serving as the Pontiac counterpart of the Chevrolet Monza, the Sunbird was offered as a two-door notchback coupé and three-door hatchback and station wagon. The model was manufactured alongside the Monza, Buick Skyhawk, and Oldsmobile Starfire at Lordstown Assembly (Lordstown, Ohio) and Sainte-Thérèse Assembly (Sainte-Thérèse, Quebec).

The second generation of the Sunbird used the compact GM J platform. Serving as the Pontiac counterpart of the Chevrolet Cavalier, the Sunbird was marketed at various times as a two-door notchback coupé or convertible, three-door hatchback, four-door sedan, and five-door station wagon. The model line was manufactured alongside the Cavalier at Lordstown Assembly (Lordstown, Ohio), Ramos Arizpe Assembly (Ramos Arizpe, Mexico), and South Gate Assembly (South Gate, California)

While not as long-running as the Bonneville, Grand Prix, and Firebird nameplates, Pontiac would use the Sunbird nameplate for 17 model years. After the Sunbird skipped the 1981 model year entirely, it was released as an early 1982 and renamed the J2000; the Sunbird name was returned for 1984. For 1995, the Sunbird underwent a substantial model update and was renamed the Pontiac Sunfire.