The meeting - being held in Geneva, Switzerland - is expected to last two days and will decide whether to
declare a global health emergency.
That could involve imposing travel restrictions on affected areas.
The outbreak began last February and has since spread to four African countries, claiming nearly 900 lives.
It comes as leading infectious disease experts have called for experimental treatments to be offered more widely.
Two US aid workers who contracted Ebola in Liberia appear to be improving after receiving an
unapproved medicine before being evacuated back to the US.
But it is not clear if the ZMapp drug, which has only been tested on monkeys, can be credited with their
improvement.
Prof Peter Piot, who co-discovered Ebola in 1976, Prof David Heymann, the head of the Centre on Global Health Security, and Wellcome Trust director Prof Jeremy Farrar said there were several drugs and
vaccines under study for possible use against Ebola.
"African governments should be allowed to make informed decisions about whether or not to use these products - for example to protect and treat healthcare workers who run especially high risks of infection," they wrote in a joint statement.
The World Health Organization (WHO), "the only body with the necessary international authority" to allow such experimental treatments, "must take on this
greater leadership role", they said.
"These dire circumstances call for a more robust international response," they added.
The WHO meeting involves the organisation's emergency committee and is solely focusing on how to respond to the Ebola outbreak.
If a public health emergency is
declared it could also involve detailed plans and efforts to identify, isolate and treat cases.
A WHO spokesman said: "We can't speculate in advance what the committee members are going to
decide in advance."
In the meantime, the World Bank is allocating $200m (£120m) in emergency assistance for countries
battling to contain the Ebola outbreak.
It is the world's deadliest outbreak to date and has centred on Guinea, Liberia and Sierra Leone. There have also been two cases in the Nigerian city of Lagos, where eight people are currently in quarantine.
British Airways has temporarily suspended flights to and from Liberia and Sierra Leone until 31 August because of the health crisis, the airline said in a statement. It follows a similar suspension by two
regional air carriers last week.
The virus spreads by contact with infected blood and bodily fluids.
The current outbreak is killing between 50% and 60% of people infected.
There is no cure or vaccine for Ebola - but patients have a better chance of survival if they receive early treatment.
Ebola has initial flu-like symptoms that can lead to external haemorrhaging from areas like eyes and gums, and internal bleeding which can lead to organ failure.
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