Zenas King (May 1, 1818 – 1892) was an American bridge builder. He started his career in 1858 and moved from Cincinnati to Cleveland, Ohio, around 1861. He established a bridge-building works on Wason Street in Cleveland in 1865. King founded the King Iron Bridge and Manufacturing Company in 1871. As early as 1878, it was manufacturing many types of truss, combination, and wooden bridges, and by the 1880s it was the largest highway bridge works in the United States. Production moved from Wason Street to larger facilities on Ruskin Avenue in 1888. The company changed its name to the King Bridge Company after his death.