While the exact founding date of Begusarai remains uncertain, its name carries echoes of the past. According to one version, it is derived from the words "Begum" (Queen) and "Sarai" (Inn), suggesting that a noblewoman may have stayed here during her travels in times past. The city's modern history received a significant boost in 1972, when Begusarai district was officially formed, having been carved out of the Munger district.
The growth of Begusarai was driven by several key factors. Its geographical location on the northern bank of the sacred Ganges River has historically favored the prosperity of agriculture and trade. Furthermore, the city became a major transport hub for the state of Bihar due to the national highways and railway lines passing through it. In the 20th century, Begusarai gained fame as the "industrial capital of Bihar" following the construction of large enterprises, including an oil refinery, which attracted a workforce to the region and spurred rapid urbanization.
Historically, the region's economy was primarily agrarian, as the fertile lands along the Ganges were ideal for farming. Culturally, Begusarai is part of the larger Mithila region, known for its art, literature, and distinctive traditions. The natural wealth of the area has long been highlighted by Kanwar Lake, located near the city—the largest oxbow lake in Asia and an important bird sanctuary recognized as a site of international significance.