Cleveland Police Chief Wayne Drummond said one person suffered serious injuries. The other eight victims suffered non-life-threatening wounds.
No suspects have been arrested. Police believe there was only one shooter.
The gunfire erupted early on Sunday in Cleveland's Warehouse District, a popular spot on Saturday nights full of bars and clubs.
Investigators believe the bullets were fired at a group of people standing on the street shortly after closing time at the bars. Seven men and two women were shot, all between the ages of 23 and 38, according to Drummond.
"This is yet another tragic incident of senseless gun violence in our city," Cleveland Mayor Justin Bibb said in a statement.
"We continue to see an uptick in shootings across our city ever since Republican lawmakers passed Senate Bill 215 last year allowing permitless carry. It's important we recognise this and hold these lawmakers accountable for passing dangerous gun laws in our state."
Elsewhere across Cleveland, one person was killed and four others wounded in various shootings across the city from Saturday night into Sunday morning, local Fox affiliate WJW reported.
"Safety is our No.1 one priority and we remain committed to doing everything we can to ensure everyone - residents, workers and visitors - feels safe in our city," Bibb said in his statement.
Across the US, there have been 368 mass shootings in 2023, according to the Gun Violence Archive. It counts each shooting in which four or more people are wounded or killed, excluding the shooter.
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