Simbang Gabi (Filipino for "Night Mass") is a devotional nine-day series of Masses practiced by Filipino Catholics and Aglipayans in the Philippines in anticipation of Christmas. This is similar to the nine-day series of dawn Masses leading to Christmas Eve practiced in Puerto Rico called Misa de Aguinaldo.
The Simbang Gabi Masses in the Philippines are held daily from December 16 to 24 and occur at different times ranging from as early as 03:00 to 05:00 PST. On the last day of the Simbang Gabi, which is Christmas Eve, the service is instead called Misa de Gallo (Spanish for "Rooster's Mass"). It has an important role in Philippine culture.