"Any further delay will have a very negative impact on peace and security not only in Kosovo," he said.
Although Kosovo officially remains a province of Serbia, it has been under U.N. and NATO administration since a 78-day NATO-led air war that halted a Serb crackdown on ethnic Albanian separatists in 1999.
In April, U.N. envoy Martti Ahtisaari recommended that Kosovo be granted internationally supervised independence - a proposal strongly supported by its ethnic Albanians but vehemently rejected by its Serb minority, Serbia and Russia.
The stalemate has sparked threats from Kosovo's former fighters to take up arms again if no solution is seen. Over the weekend the association of veterans from the 1999 war told local media they "would not sit idly" should Kosovo's independence be put in doubt.
Speaking to journalists at a conference on international migrations, Ban appealed to all parties to refrain from violence.
"I hope parties concerned will not take any unilateral moves," he told journalists.
Ban was scheduled to discuss the issue with EU foreign policy chief Javier Solana later Tuesday.
The US is going to ban exports of Iranian oil to the world market from November 5 of this year. In turn, Iran threatens to block the passage of oil tankers of the Gulf countries through the Strait of Hormuz
The choice of the city of Helsinki is not incidental as the capital of Finland had hosted US-Soviet negotiations on the limitation of nuclear stockpiles in 1969