Siam citrus is a potential horticultural commodity for export and has high economic value. This research was conducted in Umbulsari District, Jember Regency, one of the productions and marketing centres for Siam citrus in East Java Province. The research results on the production and marketing system for the Siam citrus commodity in Jember Regency show that economically the Siam citrus agribusiness provides direct economic benefits to local farmers and has a multiplier effect for a household. The marketing system has been running, involving many actors known as the perfect competition market. However, it is necessary to increase farmers' bargaining value by strengthening farmer institutions, capital institutions, and market and technology information systems. The SWOT analysis results show that the opportunity for the development of Siam citrus is still facing technical problems in cultivation and marketing institutions. However, Siam citrus cultivation is the strength component to meet domestic demand in the country.