Robert Johnston McMillan (August 21, 1885 – October 27, 1941) was a United States district judge of the United States District Court for the Western District of Texas.
Born in Galveston, Texas, McMillan received a Bachelor of Laws from the University of Texas School of Law in 1906 and entered private practice in San Antonio, Texas.
He was an assistant general attorney of the St. Louis-Brownsville & Mexico Railroad in Kingsville, Texas from 1907 to 1912.
[1] On December 15, 1931, McMillan was nominated by President Herbert Hoover to a seat on the United States District Court for the Western District of Texas vacated by Judge DuVal West.
McMillan served in that capacity until his death on October 27, 1941, in San Antonio.