The Treaty of Titalia was signed between the chogyal (monarch) of the Kingdom of Sikkim and the British East India Company (EIC).

The treaty, which was negotiated by Captain Barre Latter in February 1817, guaranteed security of Sikkim by the British and returned Sikkimese land annexed by the Nepalese over the centuries.

Risley, it was written that "by the Treaty of Titalia, British India has assumed the position of Lord's paramount of Sikkim and a title to exercise a predominant influence in that State has remained undisputed."

Signed by Captain Barre Latter as agent for the EIC and three Sikkimese officials, Nazir Chaina Tenjin, Macha Teinbah and Lama Duchim Longadoo, the primary purpose of the treaty under Article 1 was to return land previously seized by the Gorkha Kingdom of Nepal to Sikkim.

In exchange, the Sikkimese Chogyal agreed to abstain from aggression towards the Gorkhas and to allow the British to mediate any dispute with its neighbours.