The Tandag National Science High School (Filipino: Mataas na Paaralang Nasyonal na Pang-Agham ng Tandag) (TNSHS) is a secondary public science high school system located in Tandag City, Surigao del Sur, Philippines.

It is a DepEd-legislated science high school.

TNSHS is situated at Tabon-Tabon, Quezon, Tandag City, Surigao del Sur and is accessible through pedicabs, multicabs, private vehicles and motorcycles.

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