William Lynn McGrath (May 1, 1894[2] – April 18, 1975[3]) was an American business executive, who was president of the Williamson Heater Company in Cincinnati, Ohio.

[1] Under McGraths direction the Williamson Company had "diversified its product line to include cooling equipment... and had become a major supplier of containers for jet engines, missiles, and delicate electronic instrumentations.

[1] From 1949 to 1952 McGrath served "as an industry adviser to the United States employer delegate to the annual June conferences of the International Labour Organization in Geneva, Switzerland.

In 1954, he was elected for a three-year period as the United States employer representative on the governing body of that organization.

"[1] In the year 1947-1948 McGrath served as president of the Society for Advancement of Management as successor of Harold B. Maynard, and was succeeded by Charles C.