Joseph Rucker Lamar (October 14, 1857 – January 2, 1916) was an Associate Justice of the United States Supreme Court appointed by President William Howard Taft.

During his time in Augusta, he lived next door to and was the "closest friend"[2] of future president Woodrow Wilson, whose father was the local Presbyterian minister.

[2] After Lamar graduated from the Penn Lucy School near Baltimore, Maryland, he attended the University of Georgia where he was a member of the Phi Kappa Literary Society.

Lamar, together with Frederick W. Lehmann, was selected in 1914 to represent the United States at the ABC Powers Conference convened to avert a war over the Veracruz Incident.

Legislation was proposed to allow Lamar to retire with full pay, but his death just months later made the issue a moot point.