The foundations, which promote democracy, free expression and civil rights, have come under growing political and legal pressure from Prime Minister Viktor Orban, who has stifled dissent and declared last week that "the era of liberal democracy is over".
"Faced with an increasingly repressive political and legal environment in Hungary, the Open Society Foundations (OSF) are moving their Budapest-based global operations and staff to the German capital, Berlin", the network said in a statement.
Note that Orban is a big critic of Soros. It would also impose a 25 percent tax on foreign donations to NGOs that back migration. The law was termed the "Stop Soros" bill.
The prime minister views Soros as an intruder into the country's domestic politics, which are more and more being painted by Europe's growing 2015 migrant crisis.
The official campaign included posters and billboards depicting the billionaire next to the slogan, "Let's not allow Soros to have the last laugh", and accusing him of supporting illegal immigration and plotting to take control of the country.
The campaign was criticized in the Hungarian Jewish community as having anti-Semitic overtones.
'It has become impossible to protect the security of our operations and our staff in Hungary, ' Open Society Foundations said.
It is noted that, together with other worldwide sponsors of the "open society" will continue to support the work of civil society groups in Hungary such as arts and culture, freedom of media, transparency, education and health.
He launched OSF in 1979, with the Hungarian office opening five years later.
Soros, through his Open Society Foundations initiative, has pushed for pro-immigration policies attracting the ire of Orban and his supporters.
OSF cited the safety of its more than 100 employees in Hungary as well as the security of its operations there, which fund dozens of NGOs in the country of 10 million.