The 1970 United States Senate election in Maryland took place on November 3, 1970. Incumbent Democratic U.S. Senator Joseph Tydings ran for re-election to a second term, but was narrowly defeated by Republican U.S. Representative J. Glenn Beall Jr.
Tydings had defeated Beall's father, Senator James Glenn Beall six years earlier. Tydings's own adoptive father Millard had served as senator as well as Beall Sr., making this a rare dynastic election between the sons of former senators.
, this was the last time a Republican won the Class 1 Senate seat in Maryland.
Democratic primary
Candidates
Walter Gilchrist Finch, Baltimore patent lawyer
George P. Mahoney, nominee for Governor in 1966
Joseph Tydings, incumbent Senator
Charles D. White
Results
Republican primary
Candidates
J. Glenn Beall Jr., U.S. Representative from Frostburg and son of former Senator J. Glenn Beall Sr. Wainwright Dawson Harry L. Simms
Results
Results
Results by county
Counties that flipped from Democrat to Republican
Anne Arundel
Baltimore (County) Calvert Caroline Cecil Charles Frederick Harford Howard Kent Queen Anne's St. Mary's Talbot Washington Wicomico