Ventanilla (Philippine architecture)

In Philippine architecture, the ventanilla is a small window or opening below a larger window's casement, created—often reaching the level of the floor—to allow either additional air into a room during hot days or some air during hot nights when the main window's panes are drawn. It also allows for more light to strike the floor.

The ventanilla is often used on upper floor windows, as in the bahay na bato. As the lower part of a composite window, its larger upper part is typically a window with sliding capiz-shell panes. The ventanilla is just under this upper large window's sill and is typically made with sliding panel-covers behind balusters or grills.

Bobby Mañosa's traditional methods for his design of the Coconut Palace is considered as displaying a fine example of how ventanillas can be applied in modern Philippine architecture.