Santa Maria is the parish church of Óbidos and the building that occupies the small main square. The interior is panelled floor-to-ceiling in 17th-century azulejos — blue-and-white tiles in geometric and floral patterns — with a Renaissance painted ceiling above and a side chapel containing works by Josefa de Óbidos, one of the great Portuguese Baroque painters, who lived most of her life in the town.
Free entry. Photography without flash is permitted, and the church is rarely crowded once you're past the doorway.