Daniel Cauffiel (1867-1930) was a merchant, real estate developer, and entrepreneur of Johnstown, Pennsylvania and Wilmington, Delaware.

Daniel Cauffiel, one of three sons of Daniel Cauffiel (1819-1899) and Mary Hammer (1835-1900), was born on June 23, 1867, probably in Johnstown, Pennsylvania. He married Elizabeth E. Leventry (1867-1935), with whom he had seven children: Luella K. (1890-1992), Chalmer D. (1891-1949), DeWitt T. (1893-1990), Beatrice (1895-1989), Hazel (1897-1982), Daniel (1899-1984), and T. Coleman Cauffiel (1906-1985).

Cauffiel's early life was spent at Johnstown, where he and his brothers Joseph (1870-1932) and Samuel Hammer Cauffiel (1866-1949) operated a coal and stone brokerage business started by their father. From this they expanded backwards into the ownership of a small coal mining company, the Sunnyside Coal Company, and of coal lands, and then into a general real estate development business. Joseph Cauffiel concentrated on finance and insurance, eventually relocating to Toldeo, Ohio. He returned to Johnstown to serve as Mayor from 1911 to 1928. Samuel H. Cauffiel handled day-to-day affairs in Johnstown, leaving Daniel Cauffiel the time to expand his business interests.

Cauffiel's real estate business, and his closely-related interest in the Johnstown Passenger Railway Company, brought him into contact with T. Coleman du Pont (1863-1930) and Arthur Moxham (1854-1931), who represented the Louisville du Ponts and their associate Tom Loftin Johnson (1854-1911) in managing their widespread streetcar interests and The Johnson Company, a street-rail manufacturing enterprise established at Johnstown in 1889. Johnstown was booming after the disastrous 1889 flood. Cauffiel helped the street railway to acquire right of way and other real estate and benefited as the streetcar network expanded. This led to his being picked by the du Ponts to do real estate work in other parts of their street railway empire, including Kentucky, Huntsville, Alabama, and New York.

In 1903, both T. Coleman du Pont (1863-1930) and Pierre S. du Pont (1870-1954) moved to Wilmington, but Coleman continued to engage Cauffiel to do real estate work both for the DuPont Company and his personal projects. Three years later, Cauffiel took a major assignment to buy up a series of gold mining claims in California, organizing the Key Gold Mining Company and beginning operations on the site. In 1907, T. Coleman du Pont offered Cauffiel a full-time position with the DuPont Company, and he relocated to Wilmington, taking up residence at Jefferson Street and Delaware Avenue. Ultimately, Cauffiel became General Manager of the Real Estate Department and a Vice President of DuPont, in which capacity he arranged the acquisition of numerous plant sites.

In Delaware, Cauffiel continued to share in his Johnstown enterprises, with his brother Samuel acting as agent. He also began a career as a local real estate developer, buying a number of farms outside Wilmington, including an estate at Bellevue that had formerly belonged to Chief Justice Charles B. Lore (1831-1911). This remained his principal residence for the rest of his life. Cauffiel died on January 12, 1930 at Wilmington.