The Horner House and Barn, also known as the Alexander Horner House and Locust Grive Farm, is an historic home and barn which are located in Cumberland Township, Adams County, Pennsylvania.

[1] The house was built in 1819, and is a 2+1⁄2-story, five-bay, vernacular, Federal-style dwelling.

It has a main block and rear ell, and sits on an uncut fieldstone foundation.

The bank barn was built in 1840, and has two levels; it measures 100.5 by 50 ft (30.6 by 15.2 m).

Also located on the property is a contributing equipment barn, which was built in 1916, and an early nineteenth-century detached summer kitchen.