Alexis Collera Castro, better known as Alex Castro, is a Filipino model, singer, actor and politician currently serving as the Vice Governor of Bulacan since 2022. He is previously a member of the Bulacan Provincial Board from the 4th district from 2016 to 2022. He also served as a municipal councilor of Marilao from 2007 to 2013 and chairman of Sangguniang Kabataan in Barangay Lias, Marilao from 2002 to 2007. As a talent, he signed with GMA Network, yet later transferred to its rival network ABS-CBN, then returned to GMA after eleven years.

Bulacan, officially the Province of Bulacan ,(Kapampangan: Lalawigan ning Bulacan), is a province in the Philippines located in the Central Luzon region. Its capital is the city of Malolos. Bulacan was established on August 15, 1578, and part of the Metro Luzon Urban Beltway Super Region.