Tendu or Tendruk Gewog (Dzongkha: བསྟང་འབྲུག་, romanized: bstang 'brug) is a gewog (village block) of Samtse District, Bhutan.

[2] The Tendruk Gewog comprises part of Sipsu Dungkhag (sub-district), together with Bara, Biru, Lehereni, and Sipsu Gewogs.

The Indo-Bhutan border meets the Dichu near this point, with the west bank of Dichu being in India (Kalimpong district) and the east bank being in Bhutan.

Thus, part of the Tendruk gewog lies on the border with India.

The Tendruk Gewog occupies an area of 132.52 square kilometres (51.17 sq mi).