James Lane Allen (November 21, 1904 – November 5, 1992) was an American businessman who was one of the founders of the management consulting firms Booz Allen Hamilton and Strategy&, a division of PricewaterhouseCoopers.
Kellogg's James L. Allen Center for executive education is named for him.
Allen joined Edwin G. Booz Surveys in 1929 and was named a partner in 1936.
Subsequently, the firm's name was changed to Booz Allen Hamilton.
Allen led the firm from 1944 to 1970, a time of rapid growth in partners, staff, and office locations as well as diversification in services.