The 2022 San Mateo County elections were held on November 8, 2022, in San Mateo County, California, with nonpartisan blanket primary elections for certain offices being held on June 7. Two of the five seats of the Board of Supervisors were up for election, as well as all seven of the countywide elected officials, the Assessor-County Clerk-Recorder, the County Controller, the Coroner, the District Attorney, the Sheriff, the County Superintendent of Schools, and the Treasurer-Tax Collector.
Municipal elections in California are officially nonpartisan; candidates' party affiliations do not appear on the ballot.
Incumbent District 2 Supervisor Carole Groom was term limited and unable to run for reelection. San Mateo-Foster City School District Trustee Noelia Corzo beat Belmont City Councilmember Charles Stone in a runoff.
Incumbent District 2 Supervisor Don Horsley was term limited and unable to run for reelection. Menlo Park City Councilmember Ray Mueller beat San Carlos City Councilmember Laura Parmer-Lohan to replace Horsley.
Incumbent Assessor-County Clerk-Recorder Mark Church defeated David Pollack to win reelection. Church was first elected in 2010 and reelected in 2018.
Incumbent County Controller Juan Raigoza, first elected in 2014, ran unopposed for reelection.
Incumbent Coroner Robert Foucrault, who first assumed office in 2001 after the death of Coroner Adrian "Bud" Moorman died, defeated write-in candidate Mark De Paula to win reelection.
Incumbent District Attorney Steve Wagstaffe, first elected in 2010, ran unopposed for reelection.
Incumbent Sheriff Carlos Bolanos, who first assumed office in 2016 after the resignation of Sheriff Greg Munks, lost to sheriff's captain and Millbrae chief of police Christina Corpus.
Incumbent County Superintendent of Schools Nancy Magee, first elected in 2018, ran unopposed for reelection.
Incumbent Treasurer-Tax Collector Sandie Arnott, first elected in 2010, ran unopposed for reelection.