Tenzing Namgyal (Sikkimese: བསྟན་འཛིན་རྣམ་རྒྱལ་; Wylie: bstan 'dzin rnam rgyal) was the sixth Chogyal (king) of Sikkim.

In 1778, the Nepalese ruler Pratap Singh Shah broke the terms of the treaty and attacked Sikkim.

The Nepalese would occupy Sikkim for four years, annexing a considerable part of its western territories, and the Chogyal was exiled to Tibet for the remainder of his reign.

Following the Sino-Nepalese War, the 1792 peace treaty forced the Gorkhas to leave Sikkim, though the lost western territories were not restored (though the 1817 Treaty of Titalia would return some lands to Sikkim, establishing the current Nepalese-Sikkimese border) and Sikkim additionally ceded the Chumbi Valley to Tibet, though the Sikkimese retained estates there.

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