Daniel Scott Lamont (February 9, 1851 – July 23, 1905) was the United States Secretary of War during Grover Cleveland's second term.

In 1883, through his mentor Daniel Manning, Lamont was assigned to then-New York Governor Grover Cleveland's staff as a political prompter.

He became private and military secretary with the honorary rank of colonel on the governor's staff the same year and continued in his service after Cleveland became president in 1885.

Furthermore, Lamont recommended the construction of a central hall of records to house Army archives and urged that Congress authorize the marking of important battlefields in the manner adopted for Antietam.

In 1889, he went into business with William C. Whitney (Cleveland's Secretary of the Navy) and Oliver Hazard Payne (organizer of the American Tobacco trust).

Lamont spent his early summers in the Gray Gables neighborhood in Bourne, Massachusetts, on Cape Cod, near where Grover Cleveland owned a house.