Nochiseyama Castle was a Sengoku period yamashiro-style Japanese castle located in what is now part of the city of Obama, Fukui Prefecture in the Hokuriku region of Honshu, Japan. The ruins have been protected as a National Historic Site since 1997.

Obama is a city located in Fukui Prefecture, Japan. As of 1 August 2018, the city had an estimated population of 29,435 in 12,057 households and a population density of 240 persons per km2. The total area of the city was 233.09 square kilometres (90.00 sq mi). Obama gained publicity in the United States and elsewhere in 2008, as it shares its name with Barack Obama, who was running for, and later became, President of the United States.