The Fleckistock (or Rot Stock) is a 3,417 metres high mountain in the Urner Alps, overlooking Wassen in the canton of Uri.

It is the highest summit of the group lying east of the pass of Sustenjoch (2,656 metres).

This range, starting at the Stucklistock and ending at the Salbitschijen, separates the valleys of Voralp, above Göschenen and Meiental, above Wassen.

The Fleckistock is usually climbed from the south-west side, in the Voralp valley.

The Voralp hut, from where starts the normal route, is located a 2,126 metres.