Mackay Building, also known as Mackay Hall, is a historic building located on the campus of Park University at Parkville, Platte County, Missouri. It was built in 1886, and is a three-story, rock-faced limestone structure with Richardsonian Romanesque, High Victorian Gothic, and Chateauesque style design elements. It measures approximately 137 feet by 84 feet. It features a clock tower with tall spire rising in stages from a semi-detached central block, textured wall surfaces, complex roofs and towers, wall dormers, asymmetrical bays, and polychromatic color scheme.
It was listed on the National Register of Historic Places in 1979.