Santa Maragarida de Montbui is a municipality in the comarca of the Anoia in Catalonia, Spain. It is situated in the Òdena Basin, immediately to the west of Igualada of which it effectively forms a suburb. The ajuntament (town hall) is in Sant Maure. Other neighbourhoods in Montbui are the Old Town, el Saió-Coll del Guix and La Mallola.
The most famous mountain in Santa Margarida de Montbui is called La Tossa. It has an altitude of 650 m. La Tossa mountain belongs to the serra de Miralles-Queralt range.In this mountain there is a Romanesque chapel devoted to Virgin Mary and dating back to the 11th century.
The Anoia river borders Santa Margarida de Montbui to the South and separates this municipality from Igualada.