Stage 18 of the 2023 Giro d'Italia was a mountain stage that took place on .

The stage started in Oderzo and finished in Val di Zoldo, starting at with an expected finish at (average speed of 37 km/h).

The total distance of the stage was 161.8 km. The stage included 0 categorized climb(s) and 0 intermediate sprint(s), and had a total elevation gain of 4651 m, and a total descent of -3138 m.