Lucius P. Buchanan House, also known as the Ralph L. Gray Alumni Center of Missouri Southern State University, is a historic home located at Joplin, Jasper County, Missouri. It was built in 1926, and is a two-story, Spanish Revival style masonry dwelling covered in protective stucco. It has a low-pitched tiled gable roof and features multiple arched entryways and window frames, recessed porch, decorative ornamentation, and wrought iron embellishments. The prominent landscape architects Hare & Hare laid out the gardens, swimming pool and extended grounds.
In 2011, the alumni center opened and it was listed on the National Register of Historic Places in 2012.