On May 4, 2019, the city of San Antonio, Texas held an election to choose the next mayor of San Antonio.^[1] The election was a nonpartisan blanket primary. As no candidate secured a majority of the vote (50% of all votes cast +1), a runoff was held on June 8, 2019, between the two top candidates, incumbent mayor Ron Nirenberg and San Antonio City Councilman Greg Brockhouse.^[2] In the runoff, Nirenberg narrowly defeated Brockhouse, 51.11% to 48.89%.^[3]

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2019 San Antonio mayoral election

← 2017 May 4, 2019 (first round) June 8, 2019 (runoff) 2021 →
Turnout	11.46% (first round) 15.43% (runoff)
Candidate Ron Nirenberg Greg Brockhouse Party Nonpartisan Nonpartisan First round 49,579 48.67% 46,414 45.56% Runoff 61,741 51.11% 59,051 48.89%
Mayor before election Ron Nirenberg Elected Mayor Ron Nirenberg

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In the 2017 San Antonio mayoral election, Nirenberg became the first person in twenty years to defeat an incumbent mayor when he defeated Ivy Taylor in a highly contested runoff election. During his tenure in office, Nirenberg's progressive platform was often criticized and challenged by Greg Brockhouse, a more conservative member of the San Antonio City Council who also took office in 2017.^[4][5][6] Brockhouse repeatedly stated that he would challenge for the mayor's office when the 2019 elections were held. Nirenberg officially declared his candidacy for re-election on January 29, 2019^[7] and Brockhouse officially declared his candidacy on February 9, 2019.^[8]

A total of nine candidates submitted applications to be on the ballot for mayor. Nirenberg and Brockhouse were identified as the primary two candidates in the election.^[7][9]