Dunsmuir House, National Historic Landmark mansion in Oakland, United States.

Dunsmuir House is a Neoclassical-Revival mansion in Oakland, California, designed by San Francisco architect J. Eugene Freeman and completed in 1899. The 37-room house covers 16,224 square feet and holds ten fireplaces, a Tiffany-style dome, wood-paneled public rooms and inlaid parquet floors. Servants' quarters were built for 12 live-in staff.

Alexander Dunsmuir commissioned the estate in 1899 as a wedding gift for his bride Josephine but died on their honeymoon before ever living there. His widow later stayed briefly in the house and sold it in 1906 to another wealthy California family.

The estate is named for Alexander Dunsmuir, son of Robert Dunsmuir, a coal magnate from Victoria, British Columbia. Docents lead tours of the grounds and the 37-room mansion on Wednesdays and the first Sunday of the month from April to September, except July. The property is also rented for weddings, corporate gatherings, auctions and historical reenactments.

Docents lead tours of the 37-room mansion and the grounds on Wednesdays and the first Sunday of the month from April through September, except July. The 50-acre estate lies in the Oakland hills, and the non-profit organization also rents all or part of the property for weddings, corporate gatherings and historic reenactments.

Golden Gate Park landscape architect John McLaren is rumored to have helped the Hellmans lay out the Dunsmuir gardens, which hold Camperdown elms, bunya-bunya and hornbeam trees. The estate once also had a glass conservatory with a grotto, a formal garden maze and an aviary.