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 worked at Consolidated Bank for eleven years as a bookkeeper and as well involved in the aquaculture businesses, running a fishpond and sold bangus, shrimp, and crabs.

[3] Sy-Alvarado entered politics when he was appointed as officer-in-charge mayor of Hagonoy, Bulacan by President Corazon Aquino through the help of Public Works and Highways Minister Rogaciano Mercado, also a former representative from Bulacan, in 1986.

[3] Within this period, Sy-Alvarado received the Pag-asa Award for Outstanding Public Official of the Philippines by the Civil Service Commission in 1992.

Prior to the 2010 local elections, Sy-Alvarado voluntarily retired from vice-governorship to run for governor.

[4] In 2016, he was re-elected, defeating Dela Cruz and San Miguel Mayor Roderick Tiongson.

[1] He married Maria Victoria Reyes, whom he met while he was working full-time in the fishpond industry in 1976.