Dikchu is a small town in the Gangtok District of the Indian state of Sikkim. The town lies at the confluence of the Dikchu River with the Teesta River and is the site of the 96 MW Dikchu River Hydroelectric Power Project as well as 510 MW Teesta V Hydroelectric Power Project. Dikchu is the last town of Gangtok District that lies on the North Sikkim Highway connecting Singtam to Chungthang, after crossing the town we enter Mangan District. Small market north of river Dikchu also lies on Mangan District.

On 4 October 2023, heavy rains caused the glacial South Lhonak lake in Sikkim, a state in northeastern India, to breach its banks, causing a glacial lake outburst flood. The flood reached the Teesta III Dam at Chungthang at midnight, before its gates could be opened, destroying the dam in minutes. Water levels downstream in the River Teesta rose by up to 20 feet (6.1 m), causing widespread damage.