New York city holds partisan primaries for city office on September 12, 2017. Petitioning for candidates to get on a primary ballot runs from June 6 through July 13.

The Independence Party leadership already chose its favored candidate for Mayor on January 5, 2017. That choice is Paul Massey, a Republican who also plans to run in the Republican primary.

The Conservative Party leadership chose its favored candidate for Mayor on May 17. That candidate is Nicole Malliotakis, who is also running in the Republican Party primary.

The Reform Party leadership chose Sal Albanese for Mayor, earlier this month. He is a Democrat who plans to run in the Democratic primary.

Richard “Bo” Dietl, another mayoral candidate, was recently blocked from running in the Republican primary because he is not an enrolled Republican. The last time he filled out a voter registration form, he accidentally checked the boxes for both the Democratic Party and the Independence Party. On June 8, the Supreme Court, Appellate Division, upheld the decision of the lower court that he is not an enrolled Republican. He had argued that because his new voter registration form was ambiguous, he should be considered to be a Republican because his previous registration form showed him to be a Republican. That case is Matter of Dietl v Board of Elections in the City of New York, 2017 NY Slip Op. 04573. Thanks to Richard Grayson for news about the Dietl lawsuit.