The following links represent a sampling of Civil War online collections that provide a great source of research material:

American Battlefield Trust

American Civil War Collection

American Civil War Research Database

Animating Mathew Brady


Arlington Historical Society

Baseball Chronology of the Civil War

The Becker Collection - Drawings of the American Civil War Era

Mathew Brady's Photographs of Union Generals

Civil War Archives

Civil War Era Collection

The Civil War in American Art

Civil War Defenses of Washington - National Park Service

Civil War Diaries Collection

Civil War Diaries and Letters - Iowa University

Civil War Digital Collection - Furman University

Civil War Digital Digest

Civil War Letters Collection

Civil War Manuscripts Project

Civil War Photos

Civil War Primary Documents

Civil War Washington

Confederate Memorial Literary Society Image Collection

DC History Center

Digital History

Escaping Slavery, Building Diverse Communities

Gett Digital - Gettysburg College Digital Collection

Rutherford B. Hayes Presidential Museum

House Divided - The Civil War Research Engine at Dickinson College

Irish in the American Civil War

The Lincoln Log - Chronology of the President's Life

Maps of the Civil War Defenses

McAllister Civil War Prints, Ephemera, and Scrapbooks

The Medford Historical Society Photograph Collection

National Archives Civil War Photos

New York Historical Society - Civil War Treasures

New York Historical Society Digital Collections

The Petersburg Project

Project Gutenberg

Rare and Manuscripts Collections

Resources for the Study of Alexandria during the Civil War

David Rumsey Map Collection

Spared and Shared

UMBC Civil War Collection

Unionism in Virginia during the Civil War

Virginia Center for Civil War Studies

Virginia Museum of History & Culture

War of the Rebellion: A Compilation of Official Records