"A failure is always possible, particularly after five years of horrible war," Staffan de Mistura said on Swiss television channel Radio Television Suisse.
"But if there is a failure this time, after two previous meetings in Geneva on Syria, then all hope will be lost," de Mistura said, Vietnam Breaking News reported.
De Mistura is trying to coax representatives of the Assad regime and the opposition into indirect peace talks. Iafrica.com said.
The negotiations have, however, after several days, failed to move beyond the preliminary stage, with chief government negotiator Bashar al-Jaafari on Tuesday claiming the opposition was "not serious".
The Syrian opposition on Tuesday cancelled a planned meeting with de Mistura, angry at what it called "unprecedented" Russian air strikes in support of regime forces near Aleppo, AFP reported.
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