The UN High Commissioner for Human Rights, Navi Pillay, said the deaths had occurred in the past three days. More than 200 people were also injured.
Incumbent President Laurent Gbagbo says he has won the 28 November poll.
The UN and major powers have recognised Mr Gbagbo's rival, Alassane Ouattara, as the winner.
Mr Gbagbo has demanded that all foreign peacekeepers leave the country, with the authorities claiming that UN and French troops were colluding with former rebels.
UN Secretary General Ban Ki-moon on Sunday rejected the call.
Ultimatum to Gbagbo
In a statement, Ms Pillay said that "in the past three days there has been more than 50 people killed, and over 200 injured" in Ivory Coast.
More than 50 die in Ivorian post-election unrest - UN
The statement also expressed concern over "the growing evidence of massive violations of human rights" in the country.
Ms Pillay said she had received hundreds of reports of people being abducted from their homes by armed assailants.
The commissioner added that the alleged kidnappings had been "accompanied by elements of the defence and security forces or militia groups".
The UN Security Council has warned that all sides will be held accountable under international law for any attacks against civilians.
Meanwhile, the UK government has urged British nationals to leave Ivory Coast unless they have pressing reasons to stay.
The US and France have previously advised their citizens against travelling to the West African country.
The UN, the US, former colonial power France, and the African Union have all called on Mr Gbagbo to stand down.
French President Nicolas Sarkozy on Friday said he should quit by Sunday or face EU sanctions.
But Mr Gbagbo says the election was rigged by rebels who still hold the north after the civil war in 2002-03.
He was declared the winner by Ivory Coast's Constitutional Council after it annulled votes in parts of the north.
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