William "Willie" Delgado (born October 31, 1956) is a former Democratic member of the Illinois Senate, representing the 2nd district from 2006 until June 2016.

He graduated from Tilden High School and Northeastern Illinois University, where he earned his bachelor's degree in Criminal Justice, with a minor in Sociology.

Delgado began his career coordinating youth programs for the West Town YMCA, the Mayor's Office of Summer Employment and Training and the Association House of Chicago.

While with Attorney General Burris, Delgado organized and implemented the "Gun Turn in Day" program, which led to the removal of more than 142 illegal firearms from the streets of Chicago.

The five years prior to his election as representative, Delgado worked as Director of Community Services for State Senator Miguel del Valle.

He was endorsed due to his longtime standing as a community activist with an academic background in criminal justice and social work.