A total of ۵۰ potential seismic sources in Tehran and neighboring regions (۳۴˚ ~۳۷˚ N, ۴۹.۵˚~۵۴˚ E) are delineated based on available geological, Geophysical, tectonic and earthquake data for seismic hazard assessment of Tehran region. In practice, two key assumptions are considered; first, the assumption of earthquake repeatness, implying that major earthquakes occur preferentially near the sites of previous earthquakes; second, the assumption of tectonic analogy, which implies that structures of analogous tectonic setting are capable of generating same size earthquakes. A two-step procedure is applied for delineation of seismic source: first, demarcation of seismotectonic provinces; second, determination of potential seismic sources. Preferentially, potential seismic sources are modeled as area sources, in which the configuration of each source zone is controlled, mainly, by the extent of active faults, the mechanism of earthquake faultings and the seismogenic part of the crust.