Thutob Namgyal (Sikkimese: མཐུ་སྟོབས་རྣམ་རྒྱལ་; Wylie: mthu-stobs rnam-rgyal) (1860 – 11 February 1914) was the ruling chogyal (monarch) of Sikkim between 1874 and 1914.

Differences between the Nepalese settlers and the indigenous population during his reign led to the direct intervention of the British, who were the de facto rulers of the Himalayan nation.

The British ruled in favour of the Nepalese much to the discontent of the chogyal, who then retreated to the Chumbi Valley and allied himself with the Tibetans.

After his death in 1914, Sidkeon Namgyal Tulku, who had been groomed for the post by the British, succeeded him but died after ruling for just 10 months.

Sidkeong Tulku’s younger half-brother, Tashi Namgyal, who had been educated at St Paul’s and Mayo College, then became Chogyal in 1915, and ruled Sikkim until his death in 1963.