Alexander "Alex" Sangalang Cauguiran (born August 14, 1957) is a Filipino politician and activist. He served as acting president and CEO of the Clark International Airport from 2016 to 2018. He is served as chief of staff of former Angeles City Mayor Edgardo Pamintuan from 2010 to 2016 and previously from 1992 to 1998. He also served as member of the Angeles City Council from 1998 to 2004.
He studied Holy Angel University with the degree business administration. He took up Master in Public Administration at the Angeles University Foundation.
Cauguiran started became an activist during Marcos dictatorship. He participated against U.S. Bases in the Philippines.
In 2025, Cauguiran became a lead convenor of the Concerned Citizens of Pampanga due to flood control projects scandal in the Philippines.
Cauguiran became a councilor in Angeles City from 1998 to 2004 for two terms.
In 2019 elections, Cauguiran ran as mayor of Angeles City but he lost and placed third.
In 2022 elections, Cauguiran ran again as councilor in Angeles City but he lost.
Cauguiran is married to Pamela Concepcion and has one son.