Wilhelmino "Willy" Manucdoc Sy-Alvarado (born December 29, 1946) is a Filipino politician and businessman serving as the governor of Bulacan from 2010 to 2019. He previously served as a Vice Governor of Bulacan from 2019 to 2022, then he served as the house representative for Bulacan's 1st congressional district from 1998 to 2007 and Hagonoy Mayor from 1986 to 1998.