1931 San Diego mayoral election

Incumbent mayor Harry C. Clark stood for reelection to a third term.

Austin was then elected mayor with a majority of the votes in the runoff.

Incumbent Mayor Harry C. Clark stood for reelection to a third term.

During the campaign, opponents of Clark argued that there had been little progress on $8.6 million voters had approved for water projects in 1924 under Clark's tenure.

Since no candidate received a majority of the vote, Austin and Clark advanced to a runoff election.