Blair County Courthouse is an historic courthouse building located at Hollidaysburg, Blair County, Pennsylvania. It was built in 1875-1876, and is a "T" shaped stone building in the Gothic Revival style. The entrance is flanked by two square, three-story towers with truncated pyramidal roofs. The building generally features elaborate stonework and a five-story clock tower topped by a tall stone spire. A three-story rear addition was built in 1906. It was added to the National Register of Historic Places in 1976.