Map - Lakhai Upazila (Lakhai)

Lakhai (লাখাই) is an upazila of Habiganj District in the Division of Sylhet, Bangladesh.

Following the 1303 Conquest of Sylhet, Bayazid Shah, a companion of Shah Jalal, took refuge in Bulla and propagated Islam there. Bayazid remains buried in a mazar (mausoleum) in Bulla bazaar.

Lakhai was previously under the sub-registry of Charabhanga in modern-day Madhabpur Upazila. On 10 January 1922, the Lakhai thana was established as per Assam Province's gazette notification 176GK.

During the Bangladesh Liberation War of 1971, a massacre was conducted in the village of Krishnapur on 18 September. The Pakistani Army also attacked the villages of Murakari and Bhabanipur. In the village of Madna, the army set fire to the house of Dewan Ali. On 29 October, the Pakistani forces took shelter in the houses of some brokers at night in Muriyauk. Early in the morning, they wanted to go to the house of Shahjahan Chishti, a freedom fighter in Muriyauk. Unable to find Chishti at his house, the forces captured his sixty-year-old father, Abdul Jabbar, and set the house on fire. In the same village, the forces also captured 65-year old Idris Ali, father of Bengali freedom fighter Ilias Kamal. They then proceeded to kidnap the two old men to Lakhai Union. According to some sources, the next day the forces took a speed boat to Bhairab and the old men were shot dead on the way and were never found.

In 1983, Lakhai was promoted to a designated police station through the efforts of many people. On 15 April 1983, the foundation was laid for a police station at Kalauk in Bhadikara Mouza, Bamai Union. In 1984, there was a circle officer development outpost in modern-day Swajangram in Lakhai Union.