The Oberaletsch Glacier (German: Oberaletschgletscher, meaning Upper Aletsch Glacier) is a valley glacier on the south side of the Bernese Alps, in the canton of Valais.

The Oberaletsch Glacier system consists of two approximately equal arms.

The eastern one takes its starting point on the south western flank of the Aletschhorn at around 3,700 m (12,100 ft), and joins the western arm (Beichgletscher) in the valley at the foot of the Nesthorn.

The Swiss Alpine Club Oberaletschhütte (2,640 m (8,660 ft)) is above the junction of the two glacier arms and has been accessible to hikers since 2005 with a new trail from Belalp.

The area of the Oberaletsch Glacier, along with the Aletsch Glacier, was declared a UNESCO World Heritage Site in December 2001.