The Ford small block (aka Windsor V8) is a series of 90° overhead valve small block V8 automobile engines built by the Ford Motor Company from July 1961 to 2002.

Designed as a successor to the Ford Y-block engine, it was first installed in the 1962 model year Ford Fairlane and Mercury Meteor. Originally produced with a displacement of 221 cu in (3.6 L), it eventually increased to 351 cu in (5.8 L), but was most commonly sold (from 1968-2000) with a displacement of 302 cu in (later marketed as 5.0 L).

For the 1991 model year, Ford began phasing in their new Modular V8 engine to replace the small-block, beginning with the Lincoln Town Car and continuing through the 1990s. The 2001 Explorer SUV was the last North American installation of the engine, and Ford Australia used it through 2002 in the Falcon and Fairlane cars.

Although sometimes called the "Windsor" by enthusiasts, Ford never used that designation; it was only adopted informally well into its run to distinguish the 351 cu in (5.8 L) version from the 351 cu in (5.8 L) "Cleveland" version of the 335-family engine that had the same displacement but a significantly different configuration. The designations for each were derived from the locations of manufacture: Windsor, Ontario and Cleveland, Ohio.

From the mid-1970s through the 1990s the engine was marinized, and remains available for purchase from Ford Performance Parts as a crate engine.