Darwin Denice Martin (October 25, 1865 – December 12, 1935) was an early 20th-century New York State businessman best known for the house he commissioned Frank Lloyd Wright to design.

He is credited with converting all the company customer records from cumbersome ledgers to efficient card catalogs, a pioneering advance in business record-keeping at the time.

His brother, William Martin, who was living in Chicago, recommended a young architect named Frank Lloyd Wright.

While at Larkin, Martin created a unique card ledger system for tracking sales and maintaining accounts which is utilized by many corporations, in various formats, to this day.

By this time Martin had built a considerable fortune and asked Wright to design a house for him as well.

[4][5] Isabelle Reidpath Martin, Darwin's wife, was unhappy with the house due to the limited light it received, as she was nearly blind.

During a fallow period in Wright's career, Martin commissioned him to design a summer home, Graycliff, stressing that this house was to conform to Isabelle's desires.

The result was one of Wright's most important mid-career designs, taking extensive advantage of Graycliff's location on a bluff overlooking Lake Erie.

Wright designed his only cemetery monument, the "Blue Sky Mausoleum," at Darwin Martin's request, but because of the family's declining fortunes, it was not built until 2004, when Forest Lawn administrators erected the Blue Sky monument in honor of Martin and Wright.