Dhamrai (Bengali: ধামরাই) is an upazila of Dhaka district in Dhaka division, Bangladesh. It is the largest upazila in the district by land area.

Dhamrai upazila is located about 40 kilometers northwest of the capital city of Dhaka. It is bounded by the upazilas of Mirzapur and Kaliakair on the north, Singair on the south, Savar in the east, and Manikganj Sadar, Saturia and Nagarpur on the west.

The total area of the upazila is 307.41 km. Dhamrai upazila is composed of the alluvium soil of the Bongshi and Dhaleshwari rivers. Other rivers are Kolmai and Gazikhali.

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There are two theories on the naming of Dhamrai. The first is that during the time of Ashoka, there was a Buddhist called Dharmarajika and that the area was named after him. The discovery of a Buddhist stupa in Savar, about 10 miles from Dhamrai, lends credence to this opinion. Another theory is that in the early fourteenth century, five companions of the Sufi saint Shah Jalal (Tirmidhi Al-Husayni, Haji, Ghazi, Zam Bahadur, and Shah Makhdum) came and settled in the sparsely populated and heavily forested area. Food supplies ultimately ran short and one day they found a stray cow wandering about which they slaughtered the cattle to eat and satisfy their hunger. After a few days, they were approached by Dhama Gope and his wife Rai Goalini who claimed that the cow was theirs and demanded compensation for it. The Sufis learnt that the couple was childless. It is said that with their blessings a child was born to the couple and also they said that they would name the place so that their names would forever be remembered. Thus the name Dhamrai (Dham+Rai) came about.

Dhamrai was once under the Thana (now Upazila) of Savar. Dhamrai became a Thana itself in 1914 during the British rule; the same year Dhamrai Hardinge High School was established. In 1947 it was put under the district of Dhaka. On December 15, 1984, Dhamrai was upgraded into a full-fledged Upazila.

According to the 2011 Census of Bangladesh, Dhamrai had 94,776 households and a population of 412,418. 81,402 (19.74%) were under 10 years of age. It had a literacy rate (age 7 and over) of 50.8%, compared to the national average of 51.8%, and a sex ratio of 992 females per 1000 males. 60,802 (14.74%) lived in urban areas.

As of the 1991 Bangladesh census, Dhamrai had a population of 312,777. Males constituted 50.37% of the population, and females constituted 49.63%. The population of citizens 18 years and older was 163,449. Dhamrai had an average literacy rate of 29.5% (7+ years), lower than the national average of 32.4%.

The upazila consists of one municipality (pourasabha) called Dhamrai pourasabha, 16 union parishads, and 398 villages.

The union parishads are: Amta, Baisakanda, Balia, Bhararia, Chauhat, Dhamrai, Gangutia, Jadabpur, Kulla, Kushura, Nannar, Rowail, Sanora, Sombhog, Suapur, and Sutipara. They are collectively subdivided into 290 mauzas and 398 villages.

Dhamrai pourasabha is subdivided into 9 wards and 44 mahallas.

The total cultivable land is 23,470 hectares. Of the total cultivable land (in hectares):

• 1 crop: 2,050
• 2 crop: 14,580
• 3 crop: 6,740
• More than 3 crops: 100
• Intensity of cultivation: 220.83%

Farmers by land occupancy:

• Landless (less than 0.02 hectares): 11,755
• Marginal (0.02 - 0.20 hectares): 10,670
• Middle (1.01 - 3.0 hectares): 5,675
• Big (more than 3.0 hectares): 535

Food production:

• Total demand (metric tons): 65,209
• Actual production (metric tons): 75,023
• Total surplus (metric tons): 9,814

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• SOJAG: Works throughout Dhamrai and adjoining upazilas of Mirzapur, Shaturia, Kaliakoir, and Singair. The headquarters is at village Shailan under Shombhag Union.
• Grameen Choa: Located at Dhantara Bazar, Dhamrai
• SDI: Located at Dhamrai Bazar, Dhamrai
• ASA: Located at, Dhamrai, Shimulia, Dhantara, Kalampur, Kushura, Kawalipara, Bathuli, Suapur.
• JCF: Located at, Dhamrai, Shimulia, Dhantara, Kalampur, Kushura, Kawalipara, Bathuli, Suapur.

The annual Jagannath roth jatra (Ratha Yatra) chariot festival is a significant Hindu festival that draws a large number of participants. Dhamrai is particularly renowned for hosting this event. The event typically commences around the 10th day of the Bengali calendar month of Ashar, followed by the ulto roth (return of the chariot) occurring approximately one week later. To mark this occasion, Dhamrai holds a month-long roth mela (Bengali: রথ মেলা). This festival commemorates the annual journey of the Hindu deities Jagannath, Balarama, and their sister Subhadra to their aunt's temple.

During the festival, devotees assist in pulling the chariot of the deities using ropes, considering it a sacred act, despite the potential risks associated with navigating the large crowds. The processions accompanying the chariots feature devotional songs performed on drums, tambourines, trumpets, and other musical instruments. Along the route, children gather to join in the chorus. The Roth cart itself stands at approximately 45 feet (14 m) tall and is pulled by the assembled pilgrims.

The primary hub for metal crafts in Bangladesh is in Dhamrai. For many generations, this place has produced handmade metal ware for markets throughout Bangladesh, using the lost wax casting (cire perdue) method and hollow casting method. These methods are used to make items ranging from ornate Hindu and Buddhist statues to simple household objects such as pitchers (kolshi as is locally called) and also items include quality statues, decanters, bowls, spoons, and plates. Over the past fifty years, many of the families in Bangladesh who have been involved in the metal casting trade have taken on other work. With stiff competition from inexpensive machine-made aluminium and plastic products coming in from India and other countries in the region, the market for hand-cast items has gradually dwindled away. As a result, the tradition of making handmade cast metal objects is in jeopardy. For example, there are only five people left in Bangladesh who are capable of making masterpiece-quality Hindu and Buddhist images using the lost wax method. The trade is at risk of disappearance due to the dwindling number of craftsmen.

Additionally, Dhamrai is home to several families engaged in the declining practice of earthenware crafting.

There are 139 government primary schools, 16 high schools, 25 junior high schools, 109 schools run by NGOs, 11 madrasahs, 6 colleges, and 1 agriculture college in Dhamrai upazila.

• Dhamrai Hardinge High School & College, established in 1914 after the British Viceroy Lord Hardinge
• Kushura Abbas Ali High School, established in 1941
• Abdus Subhan Model High School
• Haralal High School, Amta established in 1887
• Hamida-Afaz Girls High School, Kushura
• Ruail High School, established in 1857, as one of the oldest schools not only in Dhamrai but in India and Bangladesh. It is one of the four schools established in British India as early as 1857, the year of the Sepoy Mutiny
• Elokeshi High School, Jalshin, established in 1924
• Jadavpur B M High School, established in 1929
• Berosh Shibnath Shastri Institution, established in 1936
• Suapur Nannar High School, established in 1939
• Bhalum Ataur Rahman Khan High School, established in 1957
• Balia Wadudur Rahman High School, established in 1957
• Dhamrai Girls' High School, established in 1959
• Beliswar Mohini Mohon High School, established in 1967
• Nikla Z. Haque High School, established in 1970
• Bannol Lakkhu Haji High School, established in 1969
• Jalsha High School, established in 1972
• Shailan Surma High School, established in 1973
• Afazuddin High School, established in 1988
• Shailan Surma High School
• Rajapur Kahela Baharam Mollik High School, established in 1985
• Dhalkunda High School, established in 1973

• Dhamrai Govt. University College, the highest educational institute of the locality.
• Dhamrai Hardinge High School and College
• Nobojug University College, established in 1972 in Kushura
• Abul Bashar Krishi College, established in 2003 in Mongolbari, Dhamrai
• Bhalum Ataur Rahman School Degree College, established in 1987, Bhalum, Kalampur
• Afaz Uddin School & College, established in 1988 in Sharifbag, Dhamrai
• Rajapur Begum Anowara Girls' College, established in Rajapur, Dhamrai
• Monmon School & College

• Ataur Rahman Khan, eminent politician and former prime minister of Bangladesh
• Azizur Rahman Mallick, former finance minister, education secretary, and ambassador
• ASM Tofazzal Hossain (Challenger), former actor
• Nurul Alam, educationist and vice chancellor of Jahangirnagar University
• Ziaur Rahman Khan, former politician and lawyer
• Akhtar Hossain Bhuiya, bureaucrat
• Monira Mithu, actress
• Benzir Ahmed, politician and businessman
• M. A. Maleque, politician
• Surat Ali Khan, Chemistry PhD/DIC, Imperial College of London. Project Director and Visonary who created Jahangirnagar University. He was a champion of women’s education who believed that female students deserved their own dormitories if they were to be successful in their educational pursuits. Prior to Dr. S. A. Khan’s vision female students would have to travel daily often for hours to and from their homes to university classes. He thereafter served as the Cultural and Educational Attaché from Bangladesh to Washington DC, USA. He was often featured in the Washington Post for his lavish parties replete with authentic Bangladeshi cuisine. His daughter Zakia R. Khan who attended American University in Washington DC and attained her Masters Degree in Chemistry from Howard University, became the first ever anchorwoman for the Voice of America’s Bangla Radio Broadcast. She served as a radio personality for over four decades, reaching generations of Bengali listeners.

• Surat Ali Khan, Chemistry PhD/DIC, Imperial College of London. Project Director and Visonary who created Jahangirnagar University. He was a champion of women’s education who believed that female students deserved their own dormitories if they were to be successful in their educational pursuits. Prior to Dr. S.

• Rifat Mahmud, creative and innovative individual from Dhaka, Bangladesh, who has made significant contributions across multiple fields. He is the Director of Aladin's Park Limited, a multifaceted recreational venture that includes a theme park, water park, resort, and picnic spot. His leadership and visionary approach have positioned Aladin's Park as a premier destination for entertainment and relaxation. A champion of technology and innovation, Rifat Mahmud is also the creator and developer of OvroNormal AI, an advanced artificial intelligence system. His dedication to exploring and improving AI technology has made him a prominent figure in the tech community.

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  Metal work by Dhamrai Artisan
• 
  Dhamrai Roth at Night
• 
  Old style building in Dhamrai
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  Dhamrai Police Station
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  85-yr old mosque at Shailan
• 
  Majestic old building in Dhamrai
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  Borat Nogor at dusk
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  South end of Dhamrai Township
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  Madhob Mondir, Jatrabari, Dhamrai

• Brassware industry in Bangladesh