No, Dale Carnegie is not related to Andrew Carnegie. Despite sharing the same last name, the two men are not connected by family ties. Dale Carnegie, born Dale Carnagey, changed the spelling of his last name to Carnegie later in life, likely to capitalize on the fame of Andrew Carnegie, a prominent industrialist and philanthropist of the time.
Dale Carnegie is best known for his self-improvement books, particularly How to Win Friends and Influence People, which has become a classic in the field of personal development. On the other hand, Andrew Carnegie was a Scottish-American industrialist who led the expansion of the American steel industry in the late 19th century and later became a major philanthropist.
While both men made significant impacts in their respective fields, they come from entirely different backgrounds and have no familial relationship.