"The Fog Warning" is one of several paintings on marine subjects by the late-19th-century American painter Winslow Homer and is considered among his best works on such topics.
The painting depicts a lone fisherman in a dory who has caught several halibut but now sees fog blowing up, threatening to cut him off as he rows back to his ship. His face is turned in profile to the viewer as he looks over his shoulder at the streamers of fog in the background.