Niels Thomasius Neergaard (27 June 1854 – 2 September 1936) was a Danish historian and political figure, a member of the Liberal Moderate Venstre and since 1910 of Venstre.

Neergaard was educated at the University of Copenhagen, from which he attained the degrees cand.mag.

[1] Neergaard's greatest challenges as a politician were as prime minister and finance minister after the Easter Crisis of 1920, organizing the return of South Jutland to Danish rule and having to deal with the economic crisis brought on by World War I.

[2] Neergaard's largest work as a historian, Under junigrundloven (1892-1916), is still considered the primary work on Danish politics 1848–1866.

[2] In addition to his political activities and work as a historian he also dealt with journalism, and in 1884 he founded a cultural and literary magazine, Tilskueren.