L. Birch Wilson Jr. (1883–1974) was an American political activist, newspaper editor, and civic employee. Wilson is best remembered as a member of the governing National Executive Committee of the Socialist Party of America during the 1920s and the éminence grise behind the Socialist mayoral administration of J. Henry Stump in the city of Reading, Pennsylvania as well as the editor of the Reading weekly newspaper, The Labor Advocate. His wife, (1887–1937), was a three term member of the Pennsylvania General Assembly during the decade of the 1930s.