Union Mills is an unincorporated community in Noble Township, LaPorte County, Indiana.

Joseph Wheaton, one of the earliest settlers, came to the Mill Creek in 1832 and laid out a small village.

The construction of three rail lines near Union Mills stimulated growth.

[3] Union Mills was platted in 1849, but there had been a settlement at the site for some time prior.

[6] Union Mills has a public school, South Central, that provides education from Kindergarten through 12th grade.