David M. Knezek Jr. (born August 13, 1986) is an American politician who represents the 8th district on the Wayne County Commission.

Prior to his appointment to the Wayne County Commission in 2020, he served as a member of the Michigan Senate from 2015 to 2018 and as a member of the Michigan House of Representatives from 2013 to 2014.

Knezek was defeated in the August 2018 Michigan Senate District 5 Democratic Primary by dark horse candidate Betty Jean Alexander who reported spending nothing on the campaign.

Knezek has a bachelor's degree in political science from the University of Michigan-Dearborn.

[1] He then served in the U.S. military as a scout sniper platoon member in the United States Marine Corps, completing two tours of duty in Iraq.