Archbishop's Mansion is a historic house built in 1904 and located at 1000 Fulton Street in the Alamo Square neighborhood in San Francisco, California.

[2][3] The mansion was built for Patrick William Riordan, the second Roman Catholic Archbishop of San Francisco.

[3] The house is one of the 276 properties named as part of the "Alamo Square Historic District"; designated by the city of San Francisco in July 1984 (planning code, article 10).

[6] It was constructed over bedrock and the building has a wood frame and a steel beam substructure; something uncommon in local architecture at the time.

[6] However, after a local convent building for the Sisters of Presentation was damaged in the 1906 earthquake, the nuns moved into the mansion; which was the subject of jokes.