H. Jonathon Costas (born May 14, 1957) is an American singer, musician and politician serving as mayor of Valparaiso, Indiana.

[3] In 1995, having established a successful law practice, Costas sought and won an at-large seat on Valparaiso City Council.

Columnist Pat Bankston wrote: Costas' decision to be positive rather than negative has been viewed by some in both political parties as a weakness, a lack of the killer instinct.

Costas carried the endorsements of the city's firefighters[10] and police,[11] Building Trades Council, AFL-CIO, and Operating Engineers, who historically support Democratic candidates.

[12] His campaign theme was similar to that of 1999, including calls for long term planning, controlled growth, redevelopment of "blighted areas", and more aggressive economic development to create jobs.

Through 2009, the city had spent $40M on roads, sewers, redevelopment of blighted areas, the water treatment plant, and other infrastructure, with over $30M having come from state and federal grants rather than local taxpayers.

The city built a new police station, started a road repair program, and obtained several grants for long-delayed sewer work.

The city condemned a derelict shopping center and engaged a philanthropic local family to redevelop it, donating half the cost of building a new YMCA on the site.

[20] The editorial boards of local newspapers soon began taking note of Costas's new style, with the Times claiming that other cities should "follow Valparaiso's lead" in both content and process.

He claims the city has saved $700K in insurance premiums, attracted $28M of private investment, and spearheaded the redevelopment of the former County Seat Plaza.

[20][23] In October 2023, he released The Costas Plan 2.0: Greater Things!, which includes public safety efficiency, repairing sidewalks in older neighborhoods, improving walkability in the downtown, ensuring sustainable population growth, and revamping the Valpo Sports and Recreation Campus park project.