Duncan Spears Casper (December 8, 1824 – May 20, 1898) was an early Mormon pioneer and one of the first settlers of Holladay, Utah.

[2] The next year, Casper and all of his brothers left Nauvoo for Missouri as mobs were preparing to drive the Latter Day Saints from Illinois.

[3] Casper returned to Nauvoo and brought his mother and two siblings back to Missouri, where they stayed for nine years.

[1] In 1855, Casper crossed the plains with his wife, children, and mother in Captain Hindley's Company.

In Utah Territory, they settled in Big Cottonwood (present-day Holladay), where they owned a home and land.