James Day may refer to:

James E. Day (born 1946), Canadian equestrian,

James L. Day (1925-1998), United States Marine,

James M. Day, American game designer,

James Roscoe Day (1845-1923), American minister and academic administrator,

James Wentworth Day (1899-1983), British writer and broadcaster,

James Day (journalist) (1918-2008), American public television executive and performer,

James Milford Day (1815-1894), Texas military figure,

J. Edward Day (1914-1996), American businessman and political office-holder