William Jennings (September 13, 1823 – January 15, 1886) was the mayor of Salt Lake City, Utah Territory, from 1882 to 1885.

The newly married couple moved to Salt Lake City in Utah Territory in 1852.

[1]: 501–2 Jennings opened a butchery and tannery in Salt Lake City and later founded a successful mercantile business.

The state of his business at that time made Jennings a leading merchant west of the Mississippi River.

[1]: 502–3  Eagle Emporium was later sold to the LDS Church and became a central component of Zions Cooperative Mercantile Institution (ZCMI).