James Maynard Magruder (February 9, 1900 – May 9, 1969) was an American real estate and insurance executive, as well as an attorney who served as a Democratic member of the Virginia House of Delegates representing Arlington County from 1944 to 1956.

Magruder was also active in the local Chamber of Commerce (serving on its board of directors, and in 1963 on its national affairs committee), Lions Club, and in the Knights of Columbus.

However, Campbell was narrowly defeated in the general election (by 322 votes in the Eisenhower landslide) by Republican real estate developer Joel Broyhill, who supported racial segregation and would be re-elected many times.

Magruder polled highest in that election, and was joined by fellow Democrats C. Harrison Mann and Kathryn H. Stone, who outpolled all three Republican candidates.

[8] However, Democrats retained Magruder's legislative seat as William L. Winston[9] was elected to serve alongside Mann and Stone (as again all Republican delegate candidates were outpolled).