Seseña is a municipality of Spain located in the province of Toledo, Castilla–La Mancha. It is part of La Sagra comarca. As of 1 January 2020, the municipality has a population of 27,066.
Seseña gained visibility as a result of controversial speculative development projects in Vallegrande and El Quiñón during the Spanish property bubble. The municipality is nowadays composed of four sectors that are far away from each other and have no footpath connecting them, as is usual in Spanish towns.