Theodore Calvin Arnott is a Canadian politician who was first elected to the Legislative Assembly of Ontario on September 6, 1990, representing the Riding of Wellington. He is a member of the Progressive Conservative Party of Ontario and represents the Riding of Wellington—Halton Hills in the Ontario Legislature. Arnott has served as Speaker of the Legislative Assembly of Ontario during the 42nd and 43rd Parliaments of Ontario.

The 43rd Parliament of Ontario is the session of the Legislative Assembly of Ontario which began on August 8, 2022, with the membership having been determined by the results of the 2022 general election held on June 2.