Jonathan Wilton Lines (born May 1970) is an American businessman and former chairman of the Arizona Republican Party.

He is a member of the Church of Jesus Christ of Latter-day Saints.

Lines took over the party after 2016, a difficult presidential election year.

Chairman Lines was then faced with the challenge of uniting the party before the mid-term elections.

In 2019, Lines lost re-election to former state Senator Kelli Ward.