Oserian (Masai, "Place of Peace"; locally, The Gin Palace; later, Djinn Palace) is a flower farm on the south shores of Lake Naivasha, Nakuru County, Kenya. It is Africa's largest rose producer. Oserian's wildlife corridor is more than 1 mile (1.6 km) in width through its property with reaches to the lake; it occupies 4 miles (6.4 km) of shoreline.
Originally a country estate, the Moorish-style mansion was built in 1927 by Major Cyril Ramsay-Hill, a rancher, former officer in an Indian regiment, and sometime Hollywood actor. It was based on his grandmother's home in Seville, Spain. The crenellated and domed building features minarets, and contains an "inner courtyard, fountains, squash court, swimming pool, and polo grounds". During the colonial era, Oserian was characterised as a "symbolic centerpiece" of the Happy Valley set. It was built for Ramsay-Hill's wife, Molly (née Edith Mildred Maude; 1893–1939), who had an affair with and later married Josslyn Hay, 22nd Earl of Erroll.
In 1969, Oserian was established as a small vegetable growing farm. In 1982, it became the first flower farm on Lake Naivasha.