WHO Chief Dr Tedros Adhanom Ghebreyesus said a pause would allow for at least 10% of the population in every country to be vaccinated.
A number of nations including Israel and Germany have announced plans to administer a third dose.
But Dr Tedros has warned poorer nations are falling behind.
According to the WHO, low-income countries have only been able to administer 1.5 doses for every 100 people due to a lack of supply.
Dr Tedros said that there needs to be a reversal and that the majority of vaccines should go to lower income countries.