Robert Winsor (May 28, 1858 – January 7, 1930) was a leading American financier, investment banker, and philanthropist who, as head of the Boston investment banking firm Kidder, Peabody & Co., was at the forefront of industrial consolidation during the period leading up to the Great Depression. After beginning his career at Kidder, Peabody in 1880 as a lowly clerk just out of college, Winsor was quickly promoted because of his business acumen, and was held in such great esteem by the 1920s that newspaper articles would refer to him as the "J.P. Morgan of Boston" and "one of the country's leading bankers."