Katharin "Kathy" Kelker (born May 7, 1943) is an American politician who served as a Democratic member of the Montana Senate. She previously served in the Montana House of Representatives from 2015 to 2023 before being termed out. She resigned from the Montana Senate in November 2024.
In the 2014 election, Mary McNally ran unopposed in the primary until she withdrew to become the replacement nominee for Montana Senate district 24. Kelker took her place and defeated Republican opponent Joshua Sizemore.
Kelker ran unopposed in the primary and defeated Republican Jason Thomas.
Kelker ran unopposed in the primary and defeated Republican Colton Zaugg.
Kelker ran unopposed in the primary and defeated Republican TJ Smith.
After being term limited in the House of Representatives, Kelker ran for the 24th Senate District. Kelker ran unopposed in the primary and defeated Republican Elijah Tidswell.