Also known as the Lucius Quintus Cincinnatus Lamar House, the Lucius Q. C. Lamar House in Oxford, Mississippi is the only known extant residence of the former politician and public figure. The property was declared as a National Historic Landmark in 1975 for its relation with Lamar.

Lucius Q.C. Lamar lived in this residence from 1868 to 1888, while he was still a Congressman, Secretary of the Interior, and Supreme Court justice. It is also believed that he also lived here when he wrote the Mississippi Secession Ordinance.

According to some evidence, the Lucius Q.C. Lamar House may have been built around 1857 to 1862. It was recently restored by the Oxford-Lafayette County Heritage Foundation, funded by the State of Mississippi and other grants and contributions.