The American Presidency Project is a major web resource providing a searchable database of, and analyses based on, presidential public documents. This includes speeches, orders, proclamations, messages, and other documents related to William McKinley and his administrations.

Presents a brief biography, a listing of research collections, and a selected bibliography related to William McKinley

The Ohio State University's eHistory Web site contains articles, photographs, and political cartoons related to William McKinley.

This HarpWeek Web site features political cartoons from Harper's Weekly, Leslie's Illustrated Weekly, Vanity Fair, Puck, Judge, and American Political Prints, 1766-1876: A Catalog of the Collections in the Library of Congress. It provides explanations of the historical context and images of each cartoon, campaign overviews, biographical sketches, a review of the era's major issues, and other valuable information related to McKinley's presidential campaigns in 1896 and 1900.

A documentary history of the William McKinley assassination.

This site contains information about the National McKinley Birthplace Memorial located in Niles, Ohio, which includes the McKinley Museum and the McKinley Memorial Library, a public library.

The Miller Center of Public Affairs at the University of Virginia presents essays about William McKinley and his life before, during, and after his presidential terms.

The official White House Web site presents a brief biography of William McKinley and his wife, Ida Saxton McKinley.

This site provides information about the William McKinley Presidential Library and Museum, which is owned and operated by the Stark County Historical Society. Also included is information concerning the McKinley Monument located in Canton, Ohio.