Johannes Meindert Willem Moorlach (born December 21, 1955) is an American politician who served as a member of the California State Senate representing 37th Senate district, which includes portions of Orange County, from 2015 to 2020. He was defeated for reelection by Dave Min in 2020; he lost a 2021 special election to return to the Orange County Board of Supervisors; he withdrew from the 2022 election for Orange County Auditor-Controller; and he lost the 2022 election for Mayor of Costa Mesa. A Republican, he previously served on the Orange County Board of Supervisors from December 5, 2006 to January 5, 2015 and as Orange County Treasurer-Tax Collector from March 17, 1995 to December 5, 2006.