Lynde H. Bradley was an American businesswoman and philanthropist from Milwaukee, Wisconsin, best known as the sister of Harry J. Bradley and a co-founder of the Lynde and Harry Bradley Foundation. Born into the Bradley family, which established the Allen-Bradley Company in 1903—a pioneering manufacturer of electrical controls and automation products—she played a role in the family's business endeavors alongside her brothers Harry, Alfred, and others. The company grew significantly under their leadership, becoming a cornerstone of Milwaukee's industrial economy. In 1942, Lynde and Harry established the Lynde and Harry Bradley Foundation to support educational, scientific, and civic initiatives aligned with their conservative values. Following her death in 1972, her estate provided substantial endowments to the foundation, which later received major funding from the 1985 sale of Allen-Bradley to Rockwell International. The foundation has since become one of the most influential conservative grant-making organizations in the United States, funding think tanks, policy research, and advocacy groups focused on free-market principles, limited government, and traditional values. Lynde's legacy is tied to this philanthropic network, reflecting the Bradley family's commitment to shaping public policy and cultural institutions.