The Lemp Mansion (3322 Demenil Place, Saint Louis, Missouri) is a historical house in Benton Park, St. Louis, Missouri. It is also the site of four suicides by Lemp family members after the death of the son Frederick Lemp, whose William J. Lemp Brewing Co. dominated the St. Louis beer market before Prohibition with its Falstaff beer brand. The mansion is said to be haunted by members of the Lemp family.
According to local legend, Lemp Mansion is haunted by spirits. According to the Missouri History Museum, Life magazine included the Lemp mansion in an article on America’s nine most haunted houses in 1980.
One spirit called "the monkey faced boy" is said to be William's illegitimate son, Zeke, born with Down's Syndrome and hidden away in the attic. A variation of the legend states that Zeke was William's brother, born deformed or mentally disabled. No records exist to substantiate any of the claims.