Map - Burhanuddin Upazila (Burhanuddin)

Borhanuddin (বোরহানউদ্দিন) is an upazila (or sub-district) of Bhola District in the Division of Barisal, Bangladesh.

In the eighteenth century, Agha Baqer Khan held numerous jagirs across South Bengal including the area now known as Borhanuddin. During his time, he gifted two rent-free islands in the east and west of present-day Borhanuddin to an Arab family which had arrived in the region. The chief of the family was an Islamic preacher who became renowned among the locals by the name Syed Auliya. The Sufi heritage of Borhanuddin can be recognised through the mazars of many faqirs there such as that of Rahman Faqir in Gunaighar, Kawthar Dawlat Shah Faqir in Mashakira and Muin ad-Din Faqir in Ponra.

Khairullah Hawladar was a Muslim zamindar based in Kalaiya, Patuakhali. His son and successor, Borhanuddin Chowdhury Hawladar, purchased the Kaliganj area of Krishnadevpur Pargana from Kaliprasanna Bhattacharjee, a zamindar of Faridpur. The area was first named Kaliganj by the British administration, and was unified on 15 January 1872. As Kaliganj came under the control of the Hawladars, it started to become known as Borhanuddin Hawladar's Haat. Thus at that time, Borhanuddin Haat was under the Hawladars and Baramganj (later Borhanganj) was under the control of the Hindu Bhattacharyas. Borhanuddin was first established as a replacement thana (police station headquarters) in 1876, due to a flood which heavily damaged the former thana in nearby Borhanganj. It was officially established as a thana in 1928. Around 1939, the closing of the pond ghatla designated for Borhanuddin Jame Masjid caused adverse reactions among the local Bengali Muslims. After a few lawsuits, a conflict emerged. A total area of 55 feet on both sides of the road from Onek Tiktokar Poler Para to the present Thana was settled in the name of Borhanuddin Howladar and given the present name (Borhanuddin).

During the Bangladesh Liberation War of 1971, the Borhanuddin Thana Sangram Parishad was founded on 9 March with Reza-e-Karim Chowdhury Chunnu Miah as president, Bashiruddin Miah as vice-president, Muhammad Sirajul Islam as general secretary, Doctor Sayyid Ahmad as treasurer, Anwar Husayn Bhuiyan as publicity officer and Fakhrul Alam Chowdhury and Sirajul Islam Chandu Master as members. Its student wing, the All-Parties Student Sangram Committee, was led by Muhammad Zulfiqar Ali, Tazimuddin Nurnabi, Moslem Hawladar, Jahangir Mahbub, Shahid Rab and Abu. All of the freedom forces of Bhola were based in Borhanuddin such as the force of Abul Kashem of Char Fasson in the Borhanuddin High School and Havildar Majibur Rahman's force in Borhanuddin Primary School. The India-trained faction had possession of modern weaponry. High Command Subedar Siddiqur Rahman led the home Borhanuddin force, battling the army in the villages of Sachra and Deula. Mawlana Maqsufur Rahman played an important role in the Deula victory. Other notable members of the home force of Borhanuddin were Akbar Ali, Shamsul Haq, Ibrahim Miah, Muhammad Siddiq, Nayek Asmat Ali and Lance-Nayek Ziaul Haq. On the morning of 18 October, Siddiqur Rahman and one hundred Bengali freedom fighters besieged the thana. The OC (Officer in Charge) of Borhanuddin Thana flew a white flag, signalling a surrender. Motahar Uddin, Reza-e-Karim Chowdhury MPA and CO Azizul Islam made the officers at the thana surrender. The freedom fighters collected seventy rifles and ammunition. On 22 October, houses in the villages of Tetulia, Betua and Deula were set on fire by the army. Siddiqur Rahman and his force launched an attack at Deula Dighir Par, leading to the death of 50 soldiers from the army including their supporter, the OC (Officer in Charge) of Borhanuddin Thana. The Pakistani army attempted to regain control of the thana which had been under the control of freedom fighters since 18 October. The freedom fighters thought that the Pakistani army would come from Bhola by land, and not river. However, on the morning of 29 October, the Pakistan Army arrived in Borhanuddin via gunboats and launches. The freedom fighters were not informed of this, and the army proceeded towards the thana. The army burnt down Borhanuddin bazaar and Borhanganj, whilst Tansen and Jalil shot at the army car. 71 people were killed on that day by the army, including Sayyid Ahmad Dalalpuri, the Postmaster of Borhanuddin. The army left before noon, and camped at the office of CO Dave, who supported the freedom fighters. Despite Siddiqur Rahman's force consisting of 500 freedom fighters, the brawl at the thana was unsuccessful in Borhanuddin. People from Borhanuddin also contributed to the war in other parts of the country, among the martyred are EBR Lance-Nayek Tafazzal Husayn Chakachashi in Chittagong, EBR Muhammad Sadiq Batamari in Rajshahi and EPR Mukhlisur Rahman in Comilla.

In 1976, the site of the present police station was taken from Shailabala Chaudhurani. The status of Borhanuddin Thana was upgraded to upazila (sub-district) in 1983 as part of the President of Bangladesh Hussain Muhammad Ershad's decentralisation programme.