So-called killer robots are due to be discussed at the UN Human Rights Council, meeting in Geneva.
A report presented to the meeting will call for a moratorium on their use while the ethical questions they raise are debated.
The robots are machines programmed in advance to take out people or targets, which - unlike drones - operate autonomously on the battlefield.
They are being developed by the US, UK and Israel, but have not yet been used.
Supporters say the "lethal autonomous robots", as they are technically known, could save lives, by reducing the number of soldiers on the battlefield.
But human rights groups argue they raise serious moral questions about how we wage war, reports the BBC's Imogen Foulkes in Geneva.
They include: Who takes the final decision to kill? Can a robot really distinguish between a military target and civilians?
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