Frederick Rumball Nicholls (born October 11, 1950) is a former Canadian politician who sat in the Legislative Assembly of Ontario from 2011 to 2022. He represented the riding of Chatham-Kent—Leamington. Nicholls was originally a member of the Progressive Conservative (PC) Party before he was removed in 2021 due to vaccine hesitancy. In December 2021, he joined the Ontario Party, becoming its first and only member in the legislature until losing his seat in the 2022 election.