Jack Stephen Weiss (born August 21, 1964) is an American entrepreneur and former politician. He is co-founder of BlueLine Grid alongside William Bratton and David Riker and is a former member of the Los Angeles City Council representing the 5th district from 2001 to 2009. He previously served as an Assistant United States Attorney for the Central District of California from 1994 to 2000. He is a member of the Democratic Party.