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  Thurmond 20–30% 30–40% 40–50% 50–60% 60–70% Tuck 30–40% 40–50% 50–60% 60–70% 70–80% Ploski 30–40% | |||||||||||||||||||||||||||||||||
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| Elections in California |
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The 2018 California Superintendent of Public Instruction primary election was held on June 5, 2018, to elect the Superintendent of Public Instruction of California. Unlike most other elections in California, the superintendent is not elected under the state's "top-two primary". Instead, the officially nonpartisan position is elected via a general election, with a runoff held on November 6, 2018, because no candidate received a majority of the vote.
The previous incumbent, Superintendent Tom Torlakson, was term-limited, so could not seek a third term. As no candidate received a majority in the general election, a runoff was held between two Democrats: Marshall Tuck and Tony Thurmond. Thurmond narrowly defeated Tuck.