The Doomsday List is a list of endangered lighthouses compiled by Lighthouse Digest magazine. The list usually consists of lighthouses in the United States and Canada, but occasionally includes sites from other countries as well. Inclusion on the list raises awareness that a lighthouse is in trouble. The list is updated bi-yearly. Russ Rowlett keeps an annotated version of the Doomsday List on the Lighthouse Directory. He has also compiled a Watch List of other lighthouses he feels should be on the Doomsday List.
The Nova Scotia Lighthouse Preservation Society also holds a Doomsday List of Canadian endangered lighthouses, though according to Russ Rowlett it is not truly national in scope as most of the lighthouses listed are in Nova Scotia. Russ Rowlett keeps a more complete list with no official standing.
A similar list for lighthouses in Puerto Rico was constructed by Sandra Shanklin for the Lighthouse Digest in 2002.