David Kairu Castillo (known as "Kairu") is a Filipino filmmaker and offline editor from Batanes, Philippines. Born in 2002, he is a Magna Cum Laude graduate of De La Salle-College of Saint Benilde, where he specialized in post-production.

Growing up in the breathtaking landscapes of Batanes, Kairu draws inspiration from nature and regional cinema, focusing on authentic stories and exploring underrepresented narratives. Throughout his studies, Kairu has worked on multiple short films in various roles, including director, editor, and a versatile crew member on set. As a filmmaker, Kairu hopes to create films that tell untold stories that have yet to be shown on screen.