It will be the first run through Iran - a partner of President Bashar al-Assad - has gone to such a summit with the US.
Agents of Russia, Saudi Arabia and Turkey will likewise go to the discussions.
Prior, the US said a welcome had been stretched out to Iran - a move Syria's Western-sponsored restriction addressed.
In the mean time, Russia said its flying machine had struck 118 "terrorist" focuses in Syria over a 24-hour period - another record - as an aftereffect of what its guard service said was new insight.
The fundamental round of chats on Syria is required to occur on Friday, however ambassadors say some preliminary gatherings could happen on Thursday evening.
Washington battles for clear line on Syria
"We have surveyed the welcome, and it was chosen that the remote priest would go to the discussions," Iranian outside service representative Marzieh Afkham said.
Egypt and Iraq likewise affirmed they had acknowledged welcomes to the meeting.
BBC conciliatory journalist James Robbins says that while the US is surely not inviting Iran to the Syria talks, it will now endure Tehran's association.
Iran's Fars news organization said Mr Zarif had examined support in the Vienna chats with Russian Foreign Minister Sergei Lavrov by telephone on Tuesday.
Kremlin representative Dmitry Peskov later told journalists that Russia needed an "extending of the dialog" on Syria.
Iran is accepted to have burned through billions of dollars in the course of recent years propping up President Assad's legislature, giving military consultants and sponsoring weapons.
In any case, Syria's political resistance has cautioned that Iran's contribution will just confuse the meeting in Vienna.
Both Iran and Russia - another associate of President Assad - have as of late ventured up their military part in the Syrian struggle.
Iran has since quite a while ago recognized sending military consultants to Syria, yet has precluded the vicinity from claiming any ground strengths.
Regardless of that, unverified reports not long ago said that many Iranian troops had touched base in Syria.
They were accounted for to be joining government strengths and warriors from the Lebanese Shia Islamist development, Hezbollah, in attacks on agitator positions in northern and focal Syria.
Russia started its military mediation in Syria toward the end of a month ago, propelling air strikes in backing of President Assad.
Russia and Iran have demanded that Mr Assad must be a piece of any move government and that the Syrian individuals must be permitted to choose who administers them.
The US has shown it could just endure President Assad amid a short move period, after which he ought to venture down.
Why would that be a war in Syria?
Against government challenges formed into a common war that, four years on, has ground to a stalemate, with the Assad government, Islamic State, a variety of Syrian agitators and Kurdish warriors all holding region.
Who is battling whom?
Government powers moved in Damascus and the middle and west of Syria are battling the jihadists of Islamic State and al-Nusra Front, and in addition less various alleged "moderate" revolutionary gatherings, who are most grounded in the north and east. These gatherings are additionally doing combating one another.
What's the human expense?
More than 250,000 Syrians have been murdered and a million harmed. Approximately 11 million others have been constrained from their homes, of whom four million have fled abroad - including developing numbers who are making the risky voyage to Europe.
How has the world responded?
Iran, Russia and Lebanon's Hezbollah development are propping up the Alawite-drove Assad government, while Turkey, Saudi Arabia and Qatar back the more direct Sunni-ruled resistance, alongside the US, UK and France. Hezbollah and Iran are accepted to have troops and officers on the ground, while a Western-drove coalition and Russia are doing air strikes.
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