Kenworth W900

The Kenworth W900 is a model line of conventional-cab trucks that are produced by the Kenworth division of PACCAR. The replacement of the Kenworth 900-series conventional, the W900 is produced as a Class 8 conventional-cab truck primarily for highway use. The "W" in its model designation denotes Worthington, one of the two founders of Kenworth. More than six decades after its introduction, the W900 is currently in its third distinct generation (introduced in 1982).

At its introduction, the W900 conventional was introduced alongside the K100 COE. As the Kenworth model line was expanded, the W900 became its flagship conventional, with its cab structure used across other model families. Through its production, the W900 has competed against a wide variety of model lines, including a rivalry between the model line and the Peterbilt 359, 379, and 389. Among owner-operator drivers, the W900 has remained a popular basis for truck customization, with owners adding additional chrome trim, lighting and customized wheels and paint schemes.

In 2018, Kenworth began the process of winding down the model line, introducing its all-new W990 flagship conventional. Sharing its cab with the Kenworth T680 and T880, the W990 replaced shorter-hood versions of the W900 model line. On March 19, 2025, Kenworth officially announced that it will end production of the W900 along with the T800W and C500 in 2026 due to changing emissions regulations and component constraints.

Since 1993, Kenworth has produced the model line at its Renton, Washington assembly facility.