De Lancey Nicoll (June 24, 1854 – March 31, 1931) was a New York County District Attorney.

[3] In November 1887,[4] he ran on the Citizens Reform, Republican and Irving Hall (a faction of Anti-Tammany Democrats) tickets to succeed Martine as D.A., but was defeated by his fellow Assistant D.A.

John R. Fellows who ran on the Tammany Hall/County Democracy (the larger faction of Anti-Tammany Democrats) ticket.

[7] He successfully represented Joseph Pulitzer and the New York World in a libel case that went to the U.S. Supreme Court in 1910 regarding press freedom.

[8][9] During the 1908 U.S. presidential campaign, the New York World had published an account of how a consortium involving President Theodore Roosevelt's brother-in-law Douglas Robinson, U.S. Secretary of War William H. Taft's brother Charles P. Taft, William Nelson Cromwell and J. P. Morgan had bought the French Panama Canal company for US$4,000,000 and re-sold it to the U.S. government for US$40,000,000, thus netting a fortune of about US$36,000,000.