More than 10 apartment buildings, about 10 private houses, a secondary school and several administrative buildings were damaged in the attack on the city, Governor Alexander Gusev said on Sunday.
"Our city was subjected to one of the heaviest drone attacks since the start of the special military operation," Gusev said on the Telegram messaging app, using Moscow's term for its war in Ukraine.
The full scale of the attack on Voronezh, 470km from Moscow and roughly 250km from the border with Ukraine, was not immediately clear.
Reuters could not independently verify the reports.
Ukraine says it strikes targets inside Russia in the war that Moscow launched almost four years ago to disrupt the Kremlin's war effort and in response to repeated missile and drone attacks on Ukrainian cities and infrastructure, including energy facilities.
In a post on X on Sunday, Ukrainian President Volodymyr Zelenskiy said Russia was the source of the war and deserved all retaliatory strikes.
"Only Russia is the source of this war, the reason the war is being dragged out, and it deserves all retaliatory strikes and pressure for everything it does against life and people, against diplomacy, against partners," he said.
Russia launched a hypersonic missile on Friday at a site in Ukraine near NATO-member Poland, a strike Kyiv's European allies portrayed as an effort to deter them from continuing support for Ukraine.
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