Stage 4 of the 2023 Giro d'Italia took place on .

The stage started in Venosa and finished in Lago Laceno, starting at with an expected finish at (average speed of 40 km/h).

The total distance of the stage was 176.6 km. The stage included 0 categorized climb(s) and 0 intermediate sprint(s), and had a total elevation gain of 3667 m, and a total descent of -3096 m.