Trade experts said the uncontested selection was evidence of the respect Mr Lamy had gained among both rich and poor countries, but it also reflected the WTO's struggle to remain relevant given the troubled state of global trade talks.
The WTO said no challengers had emerged since Mr Lamy announced his intention in December to stand for another four-year term. His reappointment is likely to be agreed in the next couple of months.
“Lamy is the best head that the WTO has had in terms of understanding the detail of the negotiations and recognising the disparate views of all parties concerned,” said Ngaire Woods, professor of international political economy at Oxford University.