(born June 1, 1948) is a Filipino senator who served from 2001 to 2013; and again from 2016 to the present.
He is a retired police officer who headed the Philippine National Police from 1999 to 2001.
As senator, Lacson earned a reputation as a "watchdog" of the national budget, calling out and pushing for the removal of dubious congressional insertions and appropriations locally referred to as pork barrel.
In December 2013, Lacson was appointed by then Philippines President Benigno Aquino III as Presidential Assistant for Rehabilitation and Recovery, to lead the management and rehabilitation efforts of the central provinces in the Philippines affected by Typhoon Haiyan.
Eight months into his job, Lacson secured the approval from Aquino of the phased implementation of the rehabilitation plan of six areas in the Super-Typhoon Yolanda destruction corridor, especially in the Eastern Visayas and Central Visayas regions.