Arguably the most critically-endangered language in the Philippines, Inagta Alabat (also known as Inagta Lopez and Inagta Villa Espina) is spoken by fewer than ten members of the small Agta community on the island of Alabat off the northern coast of Quezon Province on the large northern Philippine island of Luzon, and by an even smaller number of Agta further east in the province. This short sketch provides some brief sociolinguistic notes on the group, followed by an overview of its phoneme system, grammatical subsystems, and verb system. Over 800 audio recordings accompany the article, including 100 sentences, three short narratives, and a list of over 200 basic vocabulary items.