MHA Cathy Bennett will be stepping down as the MHA for Windsor Lake effective August 21.
Bennett says that she has made the decision to return to private life.
She said that she remains committed to supporting the province.
Bennett was first elected in a 2014 by-election to succeed former Premier Kathy Dunderdale, who had resigned earlier in the year.
In 2013, Bennett ran for the leadership of the Liberal Party, coming in third.
She served as Minister of Finance and Minister Responsible for the Status of Women in the Ball government.