Nathan Libby is an American Democratic politician from Maine. He represents Senate District 21, which serves Lewiston, Maine's second-largest city. Libby grew up in central Maine and attended Bates College where he majored in history and economics. He also holds a Master of Business Administration from the University of Southern Maine and works as an economic development consultant, currently as the president of Community Concepts Finance Corporation. Libby served one term in the Maine House of Representatives from 2012 to 2014 and was first elected to the Maine Senate in 2014. He served as the Senate majority leader from 2018-2020.