Websites for Historical Archives

Great Place to Start:

Google Newspapers (archives by publication) or use the Advanced Search (indicating a specific source)

Canadian

The Almonte Gazette (1861-1989)
The British Colonist (University of Victoria)
British Columbia Historical Newspapers (University of British Columbia)
Canadian Illustrated News: Images in the news: 1869-1883 (see index: AP5.C1427)
CBC Digital Archives
Collection Numerique--Journaux (Bibliotheque et Archives Nationales du Quebec)
Connecting Canadians: Canada's Multicultural Newspapers
Democracy at War: Canadian Newspapers and the Second World War (Canadian War Museum)
Digital Resources on Manitoba History
French-Canadian Newspapers: An Essential Historical Source (1808-1919)
Grey Highlands Local Newspapers (Ontario)
Halton News (Ontario)
Milton (Ontario)
Multicultural Canada
A Nation's Chronicle: The Canada Gazette
Newspapers at Library and Archives Canada
Newspapers at Memorial University (Newfoundland)
Nova Scotia Historical Newspaper Project (Cape Breton University)
Nova Scotia Historical Newspapers Online
The Ottawa Journal 1885-1980
 - Citation information only 
 - Search by keyword; can isolate by date or date range
Our Future Our Past (The Alberta Heritage Digitization Project)
Our Ontario
Our Ontario: Community Newspapers Collection
Peel's Prairie Provinces (University of Alberta)
The Penal Press: A History of Prison from Within
La Presse 1980 - 2010 (Biblioteque et Archives Nationales du Quebec)
Prince George Digitization (British Columbia)
Quesnel Cariboo Observer (British Columbia)
Saskatchewan News Index (University of Saskatchewan)
Special Editions of Canadian Newspapers
Terrace Daily Herald (British Columbia)
Vanderhoof Newspaper Archive (British Columbia)

United States

Brooklyn Daily Eagle: 1841-1902
Chronicling America: Historic American Newspapers (Library of Congress)
Colorado Historic Newspaper Collection
The Online Radio & TV Library: The Documents of AM FM & TV Broadcasting History
Richmond Daily Dispatch: 1860-1865 (University of Richmond)
TV News (Internet Archive)
Utah Digital Newspapers (University of Utah)
Vanderbilt Television News Archive (free access only to citation information)

United Kingdom

Eighteenth Century Journals: A Portal to Newspapers and Periodicals, c1685-1835
Gazettes (London, Edinburgh, and Belfast)
The Independent
Irish Newspaper Archives
IrishTimes.com
Nineteenth-Century Serials Edition (MCSE)
The Scotsman Digital Archive (free access only to citation information)
The WORD on the STREET (National Library of Scotland)

Europe

ANNO - AustriaN Newspaper Online
Historical Newspaper Library (National Library of Finland)
Historical Newspapers: Dutch Newspapers from the 17th, 18th, 19th and 20th Centuries
Nouveautes Presse et Revues (Bibliotheque Nationale de France)
Le Temps: Archives Historique (Bibliotheque Cantonale et Universitaire Lausanne, Switzerland)

International

Caribbean Newspaper Digital Library
PapersPast (National Library of New Zealand)
Trove Digitised Newspapers and More (National Library of Australia)