Mantua (/ˈmæntəweɪ/ MAN-tə-way or /ˈmænəweɪ/ MAN-ə-way) is a town on the eastern edge of Box Elder County, Utah, United States.

Mantua was settled in the mid-19th century when members of the Church of Jesus Christ of Latter-day Saints were sent by Lorenzo Snow to the valley to grow flax.

The first group arrived in Mantua in 1863 (although a sign at the main entry route states "Founded 1864"),[5] and were all émigrés from Denmark led by Hans Jens Jensen.

On the west of town is Halling Springs which runs south east into the northern end of the reservoir.

In 1959–60, Brigham City (located at the mouth of Box Elder Canyon) obtained land at the center of the valley, and raised an earthen dam on Big Creek and a dike around most of the perimeter to create Mantua Reservoir – also known as Brigham City Reservoir.

[13][14] In 1997, its two police officers issued over 1,300 speeding tickets, amounting to fines of approximately $60,000, or more than half of the city's total yearly revenue.

[16] The sole full-time police officer (and later mayor) objected to the term "speed trap" as he said he did not hide his truck, and fatal accidents had decreased since he began patrolling.

[16] In January 2020, Mantua again came under fire for unethical revenue sources, as they were issuing parking tickets on land not owned by the city, and with signage knowingly being installed wrong.

The police chief had signed the summons in which he stated that there was evidence of the violation, but was unable to produce it for the trial.

The town council subsequently changed the ordinance to make failure to obtains a dog license an infraction rather than a criminal misdemeanor, bringing the town into compliance with Utah state law, which permits a misdemeanor only for repeated offenses or in situations that are a threat to public health or safety.