Judith May Warnick (née Knapp, born May 28, 1950) is an American politician who is a member of the Republican Party. She is a member of the Washington State Senate, representing the 13th Legislative District since 2015. She was a member of the Washington House of Representatives, from 2007-2015.
Warnick was raised on a dairy farm near Deer Park. After attending Fort Wright College, she started a business in Moses Lake. She became the first woman to serve as president of the Moses Lake Chamber of Commerce.
Warnick's husband is Roy. They have three children. Warnick and her family live in Moses Lake, Washington.