The Pioneer Memorial Library is located at 115 W. Main Street, Fredericksburg, Gillespie County, in the U.S. state of Texas.

[5][6] The native limestone structure was designed in 1882 by architect Alfred Giles in the Romanesque Revival style.

[5] Building contractors John Heinen & James A. Courtney erected the structure at a cost of $23,000.

[11] When a new courthouse was built in 1939, the old building served a variety of uses, until its state of disrepair forced it to be condemned in 1963.

The building was restored in 1967 as a home for the library, a gift from Texas Instruments founder and Dallas philanthropists Mr. & Mrs. Eugene McDermott.