The Pedro Muñoz Seca Municipal Theater () is a theater in El Puerto de Santa María, Cádiz, Spain. It is named after Pedro Muñoz Seca, a playwright originally from the city. It has 600 seats.
The theater is located in Polvorista Plaza (Plaza del Polvorista), in a building that served as a barracks for a cavalry regiment of the Spanish Army in the 18th century. El Puerto de Santa María's former Main Theater (Teatro Principal) was destroyed in a fire in 1984; this new Municipal Theater was inaugurated on October 27, 2007.